Poly form Model Air. Terra Cotta Air dry clay. This package contains one 2.2-pound block of Model Air clay. This air-dry modeling clay is lightweight, durable, easy to smooth, and has exceptional pliability. It can be stamped, textured, molded, or sculpted and is great for jewelry, craft items, sculptures, school projects and more. Available in a variety of colors (each sold separately). Recommended for ages 3 and up. Conforms to ASTM D4236. Imported.