This brilliant set includes 4 sizes of heart-shaped molds, these are plastic molds with a special coating, polished to a mirror finish for great reflections and easy-release. The sizes are 1", 1-1/2", 2", and 2-1/2", and the template lets you trace and cut-out photos, papers, plastic, fabric,, etc. Use the clear lid as a dust cover while resin is setting up. With proper care, this mold is reusable indefinitely. DO NOT use a flame or high heat gun, or you may fuse the resin to your mold.