Van Aken International VA12592 Kato Polyclay, Copper Kato polyclay is an easy-to-use polymer classy that bakes in 10 minutes to become a hard, durable material Stronger than other clays, objects made with Kato polyclay become permanent works of art that will resist breaking and wear over time Its versatile and smooth texture allows for detailed results for all types of work including figures, caning, jewelry, home decor, and VA12592 making