Perfect for all brands of Oven Bake Clay - The Sculpey Tools™ nesting graduated Irregular Oval cutter set is perfect for use with not only Sculpey oven bake clay, but you can use with all other brands of polymer oven bake clay! Stainless steel rolled top edges of the round cutter set makes it easy to grip without hurting your hands. The sharp bottom allows you to cut various shapes quickly and easily. Can be used with all types of clay including polymer oven-bake clay, air dry and non dry! Tips for using the Sculpey Tools™ Nesting Graduated Heart Cutter Set - - To get round edges cover the clay with plastic wrap and then use the cutters - Make sure you are using the cutter sharp side which does not have the rolled edge. - Easy clean up after using with a baby wipe - Three sizes included for maximum creativty: .5”, 1”, 1.5”   - When using the smallest cutter if the piece of polymer oven-bake clay gets stuck in it, simply use a clay tool with a rounded edge to gently push the clay piece out of the cutter. - When using with textured clay - always texture the clay first and then cut out the shape using the cutters. - Use the smaller cutters to create an interesting hole for chain or cord when creating clay pendants