It's the lightweight, spongy modeling material that sticks to itself, but not your hands! Non-crumbling formula is easy to air-dry for saving your projects. Ideal for a wide range of hands-on learning projects and sculpting activities. Classpack™—Includes 75 pouches, 1 oz each. Clay/Pottery Type: Modeling; Color(s): Assorted; Age Recommendation: Ages 5 and Up; Assortment: (21) White; (18) Blue; (18) Red; (18) Yellow.