Crayola Air-Dry Clay is a fine, natural earth clay that air dries to a hard solid with no kiln or oven necessary. It's easy to use with traditional modeling techniques and a snap to clean up. Air-Dry Clay is smoother, finer and less sticky than traditional clay. This package contains a 5 pound tub of clay. Nontoxic. Conforms to ASTM D 4236. Made in USA.