Economical source of brilliant, opaque non-toxic tempera paint. Simply wet with water. For a bright, velvet texture, brush on any surface. Even works well on glass! When colors are mixed directly on the blocks, simply rinse with water for a fresh new surface of pure color. 9 colors: black, blue, brown, green, orange, purple, red, white and yellow. Tempera cakes measure 2-1/4" diameter and are 7/8" thick. Non-toxic.