These traditional kidney-shaped ribs are the most universally recognized pottery tool. They fit well in the hand and are useful for sculpting, hand building and throwing clay. You need one in your toolbox. Really, you do.
Mudtools stainless steel pottery and sculpture ribs are all made of cutlery grade stainless steel with varying flexibility among the tool styles.
This same shape is also available in various polymers. 3.5" x 1.75"