The company that manufactures Klean Klay has gone out of business.  Fortunately we have found a great alternative called Le Beau Touche Plasteline.  We use this product herein our manufacturing facility.

It is a non-drying, non-hardening, no-sulfur modeling clay for a variety of applications. It is non-toxic, sanitary, and odorless. Klean Klay is easy to handle and work with and remains hand-pliable at room temperature. Klean Klay keeps its smooth, firm consistency and retains the shape into which it is molded. Has many uses for sculpting, shaping or moldmaking.