Pelikan Non-Hardening Modeling Clay, 4 Colors/Pack, Assorted Colors (06700140) Plastilina clay is easily moldable and non-hardening Bright, vivid colors are easily mixable to create a masterpiece 4 colors: Blue, Green, Yellow, Red Non-toxic and conforms to ASTM D 4236 Each color weighs 1/4 lb.; One pound of clay in each pack