MAKIN'S-Clay Mixing Ruler. This handy tool will help you mix hundreds of new colors using only a few basic clay colors and there is even a chart for mixing acrylic pains with you clay to create even more colors and you could even come up with colors that are uniquely yours. This package contains one 8-1/2x2x7/8in clear acrylic ruler, one 4-1/2x1/2in and one 3-1/2x1/4in clear acrylic clay packers. WARNING: Choking and Injury Hazard-functional sharp points. Not for children under 3 years.