Mudtools Pottery Ribs – Shape 4 Polymer Rib (Blue Firm), Corner Edge for Crisp Lines, Clay Shaping Tool (B4)

When you want pottery ribs that can define as much as they smooth, reach for the Mudtools Shape 4 Polymer Rib. Mudtools designed Shape 4 around a simple idea: sometimes you need to make a point. The signature corner lays down a beautiful, crisp line on the clay, while the rest of the rib gives you a complete shaping toolkit in one piece—two flat surfaces for clean planes and controlled smoothing, plus three radiuses for refining curves and transitions. Like all Mudtools polymer pottery ribs, Shape 4 is made from a unique flexible material engineered to resist wear and the formation of burrs. With normal studio use, the surface becomes naturally burnished over time, so it glides even smoother as it breaks in. Choose from four flexibility levels—Red (Very Soft), Yellow (Soft), Green (Medium), Blue (Firm)—to match your clay body and preferred feedback. Use it on the wheel, at the table, or in sculpting—Shape 4 is the kind of pottery rib you’ll keep grabbing because it handles both subtle refinement and bold definition.

• Pottery Ribs for Crisp Lines & Defined Forms: The Mudtools Shape 4 is one of the most distinctive pottery ribs in the lineup, built with a corner that creates a beautiful line on the clay. It’s ideal when you want cleaner definition, sharper transitions, and more character in the form.
• Multiple Shaping Profiles in One Tool: This pottery rib gives you more than one working edge – Shape 4 features two flat surfaces and three radiuses, making it easy to switch between smoothing planes, refining curves, and shaping transitions without changing tools.
• Flexible Material That Resists Wear: Like all Mudtools polymer pottery ribs, Shape 4 is made from a unique flexible material that is resistant to wear and the formation of burrs. With regular studio use, it becomes naturally burnished over time for an even smoother glide across clay.
• Color-Coded Flexibility for Every Preference: Choose the feel that matches your clay and working style – Red (Very Soft), Yellow (Soft), Green (Medium), and Blue (Firm). Each option offers the same Shape 4 profile with a different level of flexibility.
• Made in the USA by Mudtools: Designed by potter Michael Sherrill and trusted by ceramic artists worldwide. Built to last, easy to clean, and comfortable in the hand—every studio needs at least one.