Description   Triangular prisms are used to disperse light, that is to break light up into its spectral components(the colors of the rainbow). It helps to show and present what a rainbow looks like, which makes it to be a nice gift for your children, lover and anyone else.   Features   - Brand: UEETEK. - Color: Shown in the pictures. - Material: K9 Optical Glass. - Size: Approx. 10 * 3 * 3cm/ 4 * 1.2 * 1.2 inch (L*W*H). - for durable use. Not easy to break. - Precise cuttings, offer good reflections and color seperation. - Easy carry for teaching/learning, presentations, etc. - Break light up into its spectral components(the colors of the rainbow). Offer good reflections and color seperation.  Packing list: 1 * UEETEK 100*30*30mm Crystal Optical Glass Triangular for Teaching Light Spectrum Physics