Counting Set Discs Educational Translucent Colorful Disc-shaped Counting Set. Discs of 10 different colors. Coloring in primary and secondary colors (red, blue, yellow, green, orange and purple) as well as transparent, black, white and double-sided mirror (black, white and mirror are opaque). They can be used alone or with a light source, for color mixing, matching, observing light, shadow, and even for wall decoration.