Kato Polyclay, oven hardening polymer clay, bakes at 275F (135C) for 30 minutes per 1/4" (5mm) thickness. Available in 17 colors including translucent and metallics. 3oz and 12.5oz bars.Kato Polyclay™ is easy to condition with no crumbling. Slice the polyclay into pieces approximately 3/16" thick and roll through the thickest setting of your pasta machine. Finish by folding and rolling.  Or, by hand, cut the clay into chunks and knead until it is soft and pliable.  Even with continuous kneading and working, Kato Polyclay maintains its ease of workability and does not become sticky.  Most Kato Polyclay colors remain unchanged from raw to cured state. Certain colors deepen very slightly when cured.  Kato Polyclay is the only clay utilizing vacuum extrusion... a state of the art process that removes internal air pockets.  Kato Polyclay is the strongest polymer clay on the market, and each color shares the same durability.  You save money because Kato Polyclay is packaged in 3 ounce blocks, 50% bigger than the other brands, at about the same price.