Approximate Size: 4 Inch, Depth: 5 mm 2. These coaster molds for resin art are made out of flexible & durable silicone, which makes it easy to release and clean up with soap and water. 3. Twist the silicone coaster molds and pop out your finished resin work after it’s completely cured. 4. These epoxy resin coaster molds are compatible with most resins or other casting materials such as epoxy resin, soap, bath bomb, candle, beverage coaster, bowl mat etc.5. Use your imagination, make unique coaster works. You can customize your resin coasters with various ideas by adding beads, rhinestones, sequins, dried flowers, or any decorative objects you like.