Sculpey Molds are made of silicone, so no messy release agents are needed. Simply mold, flex and release. Great for beginners and first time Sculpey users. Works with polymer clays, air dry and non-dry modeling clays, plaster of paris, craft soap & candle wax! Polyform Oven-Safe Silicone Boho Chic- Shapes include feathers, heart, star, geode, dream catcher, and more. Includes squeegee. Follow all baking directions on package. Largest measures approximately 3 inch long. For ages 14 and up.