Brand new and high quality Features: Can be used as teaching tools or research and decorations, they are very beautiful. Optical Glass RGB Prism, there are four lights, white light in any one of the luminous surface intake, from the remaining three light shoot out three basic colors of red, green and blue, respectively, is said three bases of the light. This is light. And, that is, from three light in red, green and blue, respectively the base light, one from the remaining surface emitting white light, which is light. This is one of the most important accessories on the projector, the projector is able to cast color shadows on the screen, you should know what color light is composed of three primary colors on the screen, color important Prisma is composed of three primary colors colors. Specification Material: Optical glass Size: 20mm x 20mm x 20mm Package includes: 1 x Optical Glass Prism RGB Prism