Super Sculpey Firm Clay: Gray - 1 Lb - Premium, Non-Toxic, Firm, Sculpting Modeling Polymer clay, Oven Bake Clay, 1 pound bar. Perfect for all advanced sculptors, artists, model makers and movie studios. Versatile - Premium sculpting clay that is firm, yet easy to manipulate. Perfect for experienced sculptors, artists, model makers and movie studios. Polymer clay is a versatile medium that is perfect for crafters/makers of all ages. This clay is perfect for modeling, sculpting and model making. Use armatures under your pieces, simple sculpting tools can blend seams easily and add amazing details! Super Sculpey is shatter and chip resistant after being baked in your home oven.Polymer Oven Bake Clay - Sculpey clay conforms to Astm D-4236 and En 71 safety standards, it is non-toxic and safe to use in your home oven. Simply make your polymer oven bake clay creation and bake in your home or toaster oven at 275 °F for about 15-30 minutes depending on the size of your creation