The BumpHave you ever made a hollow form and then tried to bump out the clay, only to find that you just cant reach your arm or your knuckle to the sweet spot? You need The Bump! The Bump is designed to extend the potters reach up to 18 inches while working in a hollow form. This gives the leverage needed to bump out, alter, or heal seams in the clay. The Bump's aluminum rod is stiff but can be altered to suit individual needs for throwing or sculpting clay.