Protolina Clay 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. Flat bars are ideal for creating parting lines and other mold making applications.

This is the replacement for Klean Klay. 

Each bar is 10" long, 3" wide, and 1/2" thick.