Features: 100% brand new and high quality Physical optics prism, colorful natural light, explain the principle of rainbow. Premium material, made of lead free k9 optic glass, solid and clear, with extremely high light transmittance and light-refracting characteristics. This optical triangular prism can be used to separate a beam of white light into its constituent spectrum of colors, ideal for science/physics light experiment tool and photography tool. Convenient to use, great size for introducing refraction and dispersion. Great gift for someone who likes light and rainbow. Package Includes: 1 x Optics Prism Specifications: Item:Optics Prism Material: k9 Glass Size: Approx 30x30x100mm/1.18x1.18x3.94 note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.