Plus Terracotta Air Dry Clay is self-hardening, air drying, premium quality clay. The soft clay has excellent elasticity for sculpting, pottery making and ceramic work. Plus Clay is strong and durable when air cured. Plus Clay with a thickness of 1/4 inch will dry in approximately 24 hours. It can be sanded, carved or drilled when dry, and the surface will accept almost any finish. This odorless and non-toxic clay can also be kiln fired a cone 6-10.