Long and lean, the Large Platter Rib is designed to give good compression when you are making plates and platters enabling you to properly compress the clay and avoid those cracks that sometimes develop. They are made with a stiff polymer, but still offer some flexibility. 11.38 Wide x 1.75" Tall. Unlike rubber ribs Mudtools polymer ribs will not develop burrs. In fact the more you use them the nicer they become and they burnish themselves as you use them.