5.1-inch silicone mold with a hollow center for a truly realistic geode agate slice look.
 
I always recommend using a good mold release whenever pouring resin into silicone molds. Wash with warm soap and water before and after use, and avoid scrubbing or scratching the mold surface. If you have resin that will not release, use a heat gun to gently release your project from the mold. Sizes are listed/pictured above. Returns or refunds on torn molds will not be accepted.