No kiln needed! These all-purpose, air-dry clay are ideal for sculpting, hand modeling or throwing on a potter's wheel. Air dry your finished pieces slowly and evenly on all sides for best results. Decorate your creations with paint, if desired. This clay is fragile when dry, but you can seal it with shellac to waterproof it.Details: Available in multiple colors 10 lb. (4.5 kg) brick weight 4 bricks of clay (includes 40 lb. total) 100% clay Treated to ensure freshness, do not fire Nontoxic Conforms to ASTM D-4236