Check the listing for details. 25x25x25mm Glass Prism Cube, Mini Optical X-Cube RGB Prism Cube, Clear. Condition: New. Listed at 17.26 USD. A glass prism cube is a tool used to split white light into its spectral colors, showing the principle of distribute. It is suitable for use in physics experiments, teaching, photography, and more.SpecificationColor: TransparentMaterial: GlassSize:25x25x25mm / 1x1x1inch (L*W*H)Packing List: 1 x Glass Prism CubeAdvantageMade of quality optical glass for superior clarity and precision, it is durable and practical for use. Moreover, it is compact, and convenient for you to carry it outside photography.InstructionStep1. Place the triangular prism on a flat surface with one of its faces down.Step2.Shine a narrow beam of white light (such as from a flashlight) at a shallow angle onto the surface of the prism.Step3.You can observe how the light reflects off the other faces of the prism, creating multiple rainbow or overlapping patterns.