Permoplast® Non-Hardening Modeling Clay is America's original non-hardening modeling clay. This product is odorless, nontoxic, and clean to use. This plastic clay can be reused when stored airtight. This non-hardening clay is great for developing small motor skills and hand/eye coordination. Each box includes 1 lb. of clay. Sold as 3 boxes for a total of 3 lbs. of clay.