The Steel Potters Ribs Tool Set Pack of 10 are an assortment of flexible steel pottery ribs of various shapes and sizes. Pottery ribs are considered an essential pottery tool and ideal for trimming, shaping and smoothing clay. Use on greenware, such as terracotta clay, earthenware or stoneware clay. Steel Potters Ribs Tool Sets can also be used to smooth and model clean clay, used for casting plaster and resin, and polymer clay such as Sculpey.