Protolina Clay by Van Aken is a general purpose, sulfur-free oil base compound with a smooth consistency natural plastalina modeling clay. Protolina never hardens, so it remains pliable and can be reused numerous times. 
Preferred by sculptors, model makers, clay animators and artists of all ages. Also great for mold walls.

This is the replacement for Klean Klay. 

We stock Protolina Clay in Soft, Medium and Firm consistency in the natural color.  A 16lb case comes with 16 one pound blocks that is made up of three 1/3 lb. sticks.