The Shape 0 Polymer Ribs are the smallest Polymer Ribs and one of the best sellers. The traditional kidney-shape of these potters ribs is the most universally recognized clay tool. These little ribs can get into tight places and are good for detail work. Introducing Pink, the softest addition to our polymer rib collection. Crafted from our ULTRA SOFT material, these ribs come in the all the trusted classic shapes.