DURABLE SiLICONE MATERIAL: These resin molds are made of high-quality silicone material, very flexible and durable, the finished product is very shiny and transparency.COMPATIBLE WITH VARIOUS CASTING MATERIALS: These silicone resin molds are compatible with diverse casting materials such as resin, concrete, plaster, polymer clay etcEASY TO RELEASE: You just need to twist the silicone mold and release the pieces out of the molds when completely cured. Or you could use mold spray, it helps extend the mold's life. After you used, wash them with soap water, let them dry out and keep them in flat, store in a cool place, avoid the heat and sharp tools.ATTENTION: It is best to pour resin in layers for this coaster mold. If amounts of resin are mixed at once, it may result in overheating and warp your mold. The chemicals heat up faster when larger amounts of resin are mixed at once and may burn or warp your pouring cup or mold.Finished product size:Square Molds :705 x 705 x 039inch Rectangle Molds:775 x 579 x 039inchRound Molds:705 x 705 x 039inch Heart Molds:70 x 50 x 039inchOval Molds:70 x 464 x 039inchcolour:transparent whiteMaterial:Silica gelPackage Contents:1 * Round Resin Mold1 * Rectangle Resin Mold 1 * Square Resin Mold1 * Heart Resin Mold1 * Oval Resin MoldOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.