Your students can create long-lasting, clay works of art without the need for an oven or kiln with the Crayola Air Dry 25 lb. Clay Pack. Crayola's non-cracking, innovative Air Dry Clay feels and performs like traditional modeling clay allowing for maximum creativity and the incorporation of small details. Dried pieces can be painted or varnished. Each white, 25lb. pack comes conveniently packaged in 5, 5lb. blocks.