Sculpey Glow in the Dark Set...America"s original oven bake clay! Sculpey is soft and pliable works and feels like ceramic clay but will not dry out when exposed to air. Shape it into your desired form and bake according to package instruction (typically 275 degrees Fahrenheit for 15 minutes for every 1/4 inch of thickness). Once cool it can be sanded drilled carved and painted with water based acrylics. Ideal for artists of all ages. Non-toxic.Sculpey Glow in the Dark Clay Kit includes 4 glow in the dark colors plus black and white for contrast. The blocks are 1 ounce each.