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! This versatile, oven safe, silicone mold is also compatible with other molding materials. Squeegee is included.