This item is a in the shape of cube. White light coming in from one side gets split into three colors, each exiting from a different side of the cube. Mine looks to the naked eye, only under magnification are some insignificant flaws visible, and those only along the outer edges. Suitable compatible with non-professionals to make some experiments compatible with explaining the basic theory of light. Features - - Material: Crystal. - Size 1: 2x2x2cm. - Size 2: 1.8x1.8x1.8cm - Size 3: 1.5x1.5x1.5cm - Can be used as teaching tools or research tools and decorations. - It may improve children’s interest of natural light and help them to discover some interesting phenomena. - Children can get the initial experience of the refraction of light and stimulate their curiosity. - A necessary equipment compatible with science class of kindergarten, primary school , junior high school and high school. - Note: This item does not fit compatible with projector, please do not put it into projector to replace the . Package list: 3 x Cube