A pottery rib is a flat, hand-sized tool you press against clay to shape, smooth and compress it. On the wheel, ribs straighten walls, remove throwing lines and pull off excess slip; in hand-building they smooth slabs and refine seams. For most home potters the best first pottery rib is a medium-flex polymer rib, followed by a stainless steel kidney rib. Below we compare six ribs from maker pages and US dealer listings. This is a research-based comparison; we did not throw pots with these tools ourselves.
New to tool names? Our best pottery tools guide shows where a rib fits in a starter kit.
Quick picks
- Best overall: Mudtools Polymer Rib, Shape 2, Green Medium (G2) (smooths and compresses, five flex grades)
- Best metal rib: Mudtools Stainless Rib, Shape 1 (cutlery-grade stainless kidney)
- Best serrated rib: Mudtools Long Scraper Stainless Rib (smooth or 12, 18 or 24 teeth per inch)
- Best budget rib: Xiem Silicone Rib (firm blue or soft orange, many shapes)
- Best basic wood rib: Kemper RB2 Potter's Rib (the rib in the PTK kit)
- Best foot rib: Dirty Girls Foot Fetish (wood rib shaped for the base)
Pottery ribs compared
| Rib | Material | Size | Flex | Best job | Typical price band | Buy |
|---|---|---|---|---|---|---|
| Mudtools Polymer Rib G2 | Polymer | 3.75 x 2.5 in (Clay-King) | Medium (5 grades) | Smoothing, compressing | $8 to $10 | Check price |
| Mudtools Stainless Rib 1 | Cutlery-grade stainless | 3.50 x 1.75 in (Archie Bray) | Flexible | Shaping, cleaning slip | $12 to $14 | Check price |
| Mudtools Long Scraper | Cutlery-grade stainless | About 6 to 7.5 in long (dealers differ) | Flexible | Scoring, planing, texture | $19 to $22 | Check price |
| Xiem Silicone Rib | Silicone | Rib 1: 3 x 1.5 x 1/4 in | Firm or soft | Smoothing on a budget | $5 to $7 | Check price |
| Kemper RB2 | Smooth hardwood | 4 1/4 in (Kemper) or 4 1/2 in (dealer) | Rigid | Basic shaping | $5 to $8 | Check price |
| Dirty Girls Foot Fetish | Wood | Not published | Rigid | Shaping the foot | $9 to $15 | Check price |
Price bands are what we saw at maker stores and US dealers in October 2026. Check the live price before you buy.
1. Mudtools Polymer Rib G2: best overall pottery rib
If you buy one rib beyond your class kit, make it a polymer rib. The Mudtools Shape 2 in Green (Medium) is the one we already recommend as the single best upgrade in our tool guide, and it earns that place here too. Mudtools calls Shape 2 a workhorse for throwing, smoothing and compressing, and says it also suits hand-building and sculpting. Dealer Clay-King lists it at 3.75 in wide and 2.5 in tall, a size that fits most hands and most mug and bowl walls.
The useful detail is the choice of flex. Mudtools makes each shape in five grades: Pink (ultra soft), Red (very soft), Yellow (soft), Green (medium) and Blue (firm), sold singly or as a set of five. Medium is the safe middle for a first rib: firm enough to move and compress clay, soft enough to bend around a curve without leaving edges. Mudtools says the material resists wear and burrs and becomes burnished with use. Shapes run from 0 to 5, plus bowl and platter ribs if you later throw wide forms. For more on the brand, see our Mudtools review.
- Shape: 2 (kidney-style); shapes 0 to 5, bowl and platter ribs also sold
- Size: 3.75 x 2.5 in (Clay-King; Mudtools prints sizes only on an image chart)
- Flex: medium (green); four other grades
- Maker SKU: MT-01-03-2
Pros
- Smooth finish without drag
- Pick the flex you want
- Resists burrs
Cons
- Softest grades bend too much to move clay
- Dimensions not in the maker's page text
Who should skip it: potters who need to cut, score or scrape clay away. That is a steel rib's job.
2. Mudtools Stainless Rib, Shape 1: best metal rib
A metal rib is thinner and stiffer at the edge than a polymer rib, so it does different work. It compresses and straightens walls with more force, cleans slip off the surface in one pull, and refines leather-hard slabs and seams. Mudtools makes its stainless ribs from cutlery-grade stainless steel and describes Shape 1 as a traditional kidney shape for sculpting, hand-building and throwing.
Archie Bray Clay, a US dealer, lists Shape 1 at 3.50 in wide, 1.75 in high and 0.10 in deep, and calls it the middle size of the three kidney ribs (Shapes 0, 1 and 5). It says the size suits dinnerware and fits most hands. Mudtools also makes Shapes 2, 4 and 7 and a small bowl rib in steel, so you can match the polymer shape you like with a metal one.
The trade-off with any metal rib is that the edge can dig into soft clay if you hold it too steeply. Use it at a low angle on the wheel, and keep it for firmer clay or the final pass on a wall. Stainless steel resists rust, but dry it anyway before it goes back in the tool bag.
- Shape: 1, kidney
- Size: 3.50 x 1.75 x 0.10 in (Archie Bray)
- Material: cutlery-grade stainless steel
- Maker SKU: MT-02-01-1
Pros
- Cleans slip and refines walls in one pass
- Rust resistant
- Dinnerware size
Cons
- Edge can gouge soft clay
- Flex not stated for this shape
Who should skip it: brand-new throwers still learning to center and pull; start with a polymer rib and add steel later.
3. Mudtools Long Scraper Stainless Rib: best serrated rib
A serrated rib has small teeth along one edge. Drag it across leather-hard clay and it shaves off high spots, levels a lumpy hand-built wall and scores joins; follow with a smooth edge and the surface comes back clean. Mudtools makes its Long Scraper in four edges: smooth (SSL), 12 teeth per inch (SSL12, regular), 18 teeth per inch (SSL18, fine) and 24 teeth per inch (SSL24, extra fine), plus a set of all four.
Mudtools says the smooth edge is for throwing and the toothed edges are for scoring, scraping and planing, and that the rib suits sculpting and hand-building too. Archie Bray describes the SSL12 as having the teeth on one side with a curved edge and a flat edge, so one tool covers both a convex wall and a flat slab. The 12 tpi edge removes clay fastest; 24 tpi leaves a finer surface. For hand-builders, a serrated rib does much of the work of a surform at a fraction of the bulk.
Sources disagree on size. Archie Bray lists the Long Scraper at 6.00 x 1.25 x 0.10 in; The Ceramic Shop lists 1.75 x 7.5 in. Mudtools shows its measurements only in an image. Expect a rib roughly 6 to 7.5 in long.
On a tight budget, Kemper's S10 serrated steel scraper (3 3/4 in, thin spring stainless) does the same basic job for a few dollars.
- Edges: smooth, 12, 18 or 24 teeth per inch
- Size: 6.00 x 1.25 in (Archie Bray) or 1.75 x 7.5 in (The Ceramic Shop)
- Material: flexible cutlery-grade stainless steel
- Uses: scoring, scraping, planing, surface texture
Pros
- Levels and refines hand-built forms fast
- Choice of tooth size
- Curved and flat edges
Cons
- Pricier than basic scrapers
- Scraping dry clay makes dust
Who should skip it: throwers who rarely hand-build or alter pots. A smooth stainless rib covers wheel work.
4. Xiem Silicone Rib: best budget rib
Xiem's Studio Silicone Clay Ribs are the cheapest good smoothing ribs in this guide. They come in numbered shapes (SCR1 to SCR8) in two firmness grades: firm blue and soft orange, with an ultra-soft lime green set (SCRS, SCRM, SCRL) for final finishing. At a few dollars each, you can buy two shapes in different firmness for less than one premium rib.
The Ceramic Shop lists Rib 1 at 3 in wide, 1.5 in tall and 1/4 in thick with a perforated grip area, a compact size for mugs, cups and small bowls. Silicone behaves much like polymer on the wheel: it presses the wall smooth, compresses the surface and leaves no tool marks if the clay is wet enough. The firm blue is the better first choice; the soft orange is more of a finishing tool and can feel floppy when you try to move clay with it.
Dimensions are published only for some shapes, so check the listing before buying a larger rib for bowls. Our Xiem pottery tools review covers the rest of the range.
- Shapes: SCR1 to SCR8; ultra-soft SCRS, SCRM, SCRL
- Size: Rib 1 is 3 x 1.5 x 1/4 in (The Ceramic Shop)
- Firmness: firm blue, soft orange, ultra-soft lime green
- Material: silicone
Pros
- Very low cost
- Firmness shown by color
- Many shapes
Cons
- Sizes published only for some shapes
- Soft grade too floppy for shaping
Who should skip it: potters who already own a polymer rib they like. The gain is small.
5. Kemper RB2 Potter's Rib: best basic wood rib
The Kemper RB2 is the smooth hardwood rib that comes in the Kemper PTK Pottery Tool Kit, so many beginners already own one. A dealer listing describes the RB shapes as covering opening, shaping, curving, smoothing and trimming wet clay on the wheel. Wood is rigid, warm in the hand and cheap, and a wooden rib is good at straightening a cylinder wall and lifting slurry off the surface.
Kemper's RB range runs from 3 1/2 in to 5 3/4 in, plus a Double 0 rib. Kemper lists the RB2 at 4 1/4 in; the Kalamazoo Valley Community College bookstore lists it at 4 1/2 in. When we checked in early October 2026, Kemper's own store showed the RB2 out of stock, so a dealer may be the easier source. Our Kemper pottery tools review covers the kit and the rest of the line.
Wood has two downsides. It soaks up water, so it needs to dry between sessions, and it leaves more surface texture than polymer or silicone. Ceramic Arts Network notes that a wood rib's edge dulls over time and can be freshened with a sander.
- Length: 4 1/4 in (Kemper) or 4 1/2 in (KVCC bookstore)
- Material: smooth-finished hardwood
- Range: RB sizes 3 1/2 to 5 3/4 in, plus RB00
- Included in: Kemper PTK kit
Pros
- Very cheap
- Rigid for straight walls
- Edge can be resanded
Cons
- Absorbs water
- Leaves more texture than polymer
- Stock gaps at the maker
Who should skip it: anyone whose kit already includes a wood rib. Spend the money on a polymer or steel rib instead.
6. Dirty Girls Foot Fetish: best foot rib
Some ribs are shaped for one job, and the Dirty Girls Foot Fetish is one of the best-known examples. It is a wood throwing rib shaped to work the base of a pot, so you can define the foot and remove extra clay from the bottom while the pot is still on the wheel. Ceramic Arts Network describes the same idea with a notched wooden foot rib: pressing the tip into the base narrows the foot and removes clay, which can cut down or skip later trimming.
Dirty Girls is a small maker (sold under Kentucky Mudworks), and dealers we checked do not publish the rib's dimensions. A larger Big Foot Fetish version is also sold for bigger pots. As with any wood rib, let it dry between sessions so it does not swell or crack.
This is a second or third rib, not a first one. It makes most sense once you are throwing mugs and bowls regularly and want cleaner bases with less time at the trimming stage. Our Dirty Girls pottery tools review lists the brand's other wood ribs and shapers.
- Type: wood throwing rib for the base and foot
- Size: not published by dealers checked
- Versions: Foot Fetish, Big Foot Fetish
- Maker: Dirty Girls (Kentucky Mudworks)
Pros
- Job-specific shape
- Can reduce trimming
- Low cost
Cons
- Size not published
- Wood needs drying
- One job only
Who should skip it: beginners who do not yet own a general-purpose polymer or steel rib.
How to choose a pottery rib
Rubber, polymer and silicone ribs
Soft ribs are for smoothing and compressing. They bend around a curve, press the clay particles together at the surface and leave no edges, which is why most throwers use one on every pot. Polymer ribs (Mudtools) tend to hold their edge longer; silicone ribs (Xiem) cost less. Both work best on clay that is still wet from throwing.
Metal ribs
A metal rib is the most precise rib tool in ceramics. Use it to straighten walls, remove slip, sharpen a shoulder or a profile and refine leather-hard slabs and seams. Thin, flexible stainless ribs bend into curves; heavier ones hold a straight line. Hold them at a low angle so the edge does not dig in.
Serrated ribs
Teeth turn a rib into a scraper. Serrated ribs level lumpy hand-built forms, carve facets, score joins and add texture. Coarse teeth remove clay faster; fine teeth leave a smoother surface. Finish with a smooth rib if you want the marks gone.
Wood ribs
Wood is rigid, cheap and easy to modify, which is why it fills class kits and specialty shapes such as foot ribs. It absorbs water and leaves more texture than polymer or steel, so most throwers keep one wood rib and use softer ribs for the final finish.
Flexibility and shape
For a first soft rib, choose a medium flex. Very soft grades are finishing tools; firm grades move more clay but can leave edges. Match the shape to what you make most: a kidney shape for mugs and general use, a long or straight rib for tall cylinders, a large curved bowl or platter rib for wide forms, and a foot rib for the base.
Ribs for hand-building
Hand-builders use ribs more than many people expect. A soft rib removes canvas texture from a rolled slab, a steel rib smooths seams after you join them, and a serrated rib levels a wall. Our slab pottery guide covers the slab methods, and our score and slip guide covers joining. For the wider family of shaping tools, see our pottery shaping tools guide.
How many ribs you need
Two cover most beginners: a medium polymer or firm silicone rib and a stainless kidney rib. Add a serrated rib if you hand-build, and a bowl rib or foot rib once you know which forms you throw most. You do not need a full set to start.
Using a rib on the wheel
- Pull the walls first; ribs refine a form, they do not replace pulling.
- Wet the rib and the clay, and slow the wheel down.
- Support the wall from the inside with your fingers or a sponge, and hold the rib against the outside at a low angle, trailing in the direction the wheel turns.
- Move up the wall in one slow pass to remove throwing lines and lift slurry off the surface.
- Use a rib on the floor of a bowl or cup to compress the base. Our wheel throwing for beginners guide walks through the full process.
Care, storage and dust
Rinse ribs in a bucket of water at the end of a session rather than in the sink. Let wood ribs dry fully before you store them, and dry stainless ribs so water does not sit on them. Store polymer and silicone ribs flat so they keep their shape.
Scraping and planing leather-hard or dry clay makes fine particles that contain silica. Scrape at leather hard rather than bone dry, wet wipe your table instead of sweeping, and wear a NIOSH-approved respirator when you handle dry clay or glaze materials. Our clay dust safety guide explains studio cleanup.
Sources: Mudtools polymer ribs collection and Shape 2 Polymer Rib page; Mudtools stainless ribs collection, Shape 1 Stainless Rib and Long Scraper Stainless Rib pages; Clay-King Mudtools Shape 2 listing; Archie Bray Clay Stainless Steel Rib #1 and Long Scraper SSL12 listings; The Ceramic Shop Mudtools Long Scraper and Xiem Silicone Rib 1 listings; Chesapeake Ceramics Xiem listings; Kemper RB2 product page; Kalamazoo Valley Community College bookstore Kemper RB2 and S10 serrated scraper listings; Seattle Pottery Supply Kemper wood rib listing; Krueger Pottery Dirty Girls listings; DiamondCore pottery ribs article; Ceramic Arts Network uses of potter's ribs article. Research-based comparison, no hands-on testing. Specs checked October 2026.