Can be molded and shaped again and again for a fun, tactile learning experience. Non-toxic, never dries out, nothing to wear out. Delta Sand always acts like wet sand! Sanitize by spraying a mist of chlorine bleach and water, and let air dry before use; or bake DeltaSand (250 degree oven for about 45 minutes), allow to cool enough to be handled safely, and crumble to sand. Plastic molds not included. Set Includes 5 lb. (900 grams) of DeltaSand, and Tray