Features: Can be used as teaching tools or research and decoration, they are very beautiful. Optical Glass RGB Prism, there are four lights, white light in one of the lighting inputs of the lighting surface, from the three remaining lights, three basic colours red, green and blue, respectively, are said three bases of the light. It's lightweight. And that is, three red, green and blue lights, respectively the base light, one of the remaining surface emitting white light, which is the light. It is one of the most important accessories on the projector, the projector is capable of projecting color shadows on the screen, you need to know which color of light is composed of three primary colors on the screen, an important color Prism colors. Specification Material: optical glass. Size: 20 mm x 20 mm x 2 mm. Package includes: 1 x RGB prism optical glass prism