Material: Made with durable silicone, clean and transparent, high Flexible, washable, smooth soft, not easy to deform. This resin casting mold is reusable. 1x Coaster Mold. 4x Coaster Mold. Easy to Release: Simple for butterfly mold shape, with the smooth and glossy interior surface, just need to twist the silicone resin molds and release your creation out of your molds.