POLYFORM-Sculpey Kit: Eraser Clay Set. You can create fun and colorful clay erasers with this kit! This package contains four 1 oz bars of clay in different colors. Available in a variety of designs; each sold separately. Conforms to ASTM D 4236. Made in USA. of usable erasers. Includes four one ounce pieces of clay and instructions. Made in USA. Recommended for ages 8 and up.