Wood ribs are 1 cm thick pieces of European beech carefully shaped, carved to a fine edge, and finished with tung oil for extra durability. Designed for maximum functionality when throwing. The shapes vary according to the function and size of the clay objects. Large plate ribs for large plates, tiny bowl ribs for very small pots, and straight cylinder ribs for tall cylinders, Rigid ribs are the best for achieving form. The fine edge of the rib reduces torque on the pot. If the rib becomes slightly worn and the grain becomes raised, lightly sand the edge of the rib to bring back its high performing edge. Easily cleaned with water and a soft brush such as a toothbrush. As with all wooden tools do not leave them to sit in water for any length of time.