The Color Wheel Co. Color wheel provides a simple, visual aid for illustrating and teaching color relationships. It is a basic tool used by teachers, students, artists and anyone making color selections. Includes: grey scale, tints, tones, shades, and results of mixing colors, plus illustrations of color harmonies. It also defines primary colors, secondary colors, warm and cool colors, basic terms and more. 9 1/4"- UV coated.