DURABLE SiLICONE MATERIAL: These resin 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 are compatible with diverse casting materials such as resin, concrete, plaster, polymer clay etc EASY TO RELEASE: You just need to twist the silicone mold and release the pieces out of the 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 large coaster mold. If large 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 :7.05 x 7.05 x 0.39inch Rectangle :7.75 x 5.79 x 0.39inch Round :7.05 x 7.05 x 0.39inch Heart :7.0 x 5.0 x 0.39inch Oval :7.0 x 4.64 x 0.39inch colour:transparent white Material:Silica gel Package Contents: 1 * Round Resin Mold 1 * Rectangle Resin Mold 1 * Square Resin Mold 1 * Heart Resin Mold 1 * Oval Resin Mold Only 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.