Specifications: This set is used for study of color mixing on the color mixing disc. The disc has 7 color as purple, indigo blue, blue, green, yellow, orange, and red. When the disc is rotating, we will see the disc is white because the white color is compose of 7 color call "spectrum". Diameter of disc is 25 cm and content in 35x35x10 cm transparent acrylic box. Base size is 35x35x10 cm and made from MDF plywood coated by formica.