High Quality Features: Can be used as an educational tool or for research and decoration, they are very beautiful. Optical glass RGB prism, there are four lights, white light in one of the luminous surface areas, from the remaining three lights, three base colors of red, green, and blue are produced, respectively, said to be the three bases of light. This is light. And it means, from three lights of red, green, and blue, respectively base light, one from the remaining surface that emits white light, which is light. This is one of the most important accessories for the projector, the projector can cast color shadows on the screen, you should know which color light consists of three primary colors on the screen, color important prism prism is formed by three primary colors. Specifications Material: Optical glass Size: 20mm x 20mm x 20mm What's in the package: 1 x optical glass RGB prism