These coaster molds are made of high-grade soft silicone with a shiny surface. The finished products have a mirror effect. Easy To Clean Resin: Just twist the silicone resin molds and release your creation out of your coaster molds after the resin is completely dry and cured. The easiest way to demold is to first peel from the edge slowly. This Silicone Mould is Made of Non-toxic and environmentally friendly Silicone. This Silicone Mould is ideal for making various amazing coasters, bowl mat, home decorations, pendants, paperweights, candle holders, spoon rest, desk decorations, wall decorations, and much more. The silicone mold is flexible, durable and reusable. Great Idea To Gift: Such a great gift for yourself or someone you care about. Using these silicone resin molds to make personalized geode agate trays for your family& friends.