Crayola Model Magic Tubs have a unique molding material that is lightweight and spongy even after drying. They require air-drying (drying time depends on size of artwork), and are soft and pliable for easy use. These allow clean-handling, are safe, non-toxic and do not crumble or stick to skin and clothing. Dried pieces can be decorated with markers paints and glitter glue, and decorative items can be added by gluing onto dried pieces into soft pieces. These tubs have soft squishy modeling material. These products are made in USA, and are recommended for children ages 5 and above. Keep finished product away from open flame, and do not put in oven microwave or kiln. The net weight of the tub is 2 pounds.