KATO POLYCLAY was developed in collaboration with one of polymer clay's pioneer artists, Donna Kato! With other professional artists in mind, together, we've formulated a polymer clay that embodies the most desirable working properties possible. This oven-hardening polymer clay maintains easy workability even after continuous kneading. Its color and consistency stay uniform.Details:Assorted colorsContain four 2 oz. barsOven-hardeningPolymer clay