Optical Glass RGB Prism, there are four lights, white light in any one of the illuminating surface intake, from the remaining three light three base colours of red, , 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 shadows of color on the screen, you should know what color light is composed of three primary colors on the screen, color important is formed of three primary colors. Features - - Material: Glass - Size: 2.2x2.2x2.2mm. -Note: The color of the box is . - Can be used as teaching tools or research and decorations, they are very beautiful. - Also can be used as children intelligence development toy or art decoration. - Children can get the initial experience of the refraction of light and stimulate their curiosity. - A necessary equipment for kindergarten, primary school science class, junior high school, high school. - Warm Tip: Dear buyer, Due to lighting effect,monitor's brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand! Thank you! Package list: 1 -CUBE