AMACO-Cloud Clay. This modeling clay will stretch far enough to fit your child's imagination! Cloud Clay is a soft modeling material that dries in the air. This package contains 4oz of Cloud Clay. cONFORMS TO ASTM D4236. Recommended for ages 4 and up. Imported. each sold separately. Conforms to ASTM D 4236. Recommended for ages 3 and up. Imported.