Features:Main MaterialMade of optical glass, high transparency and clarity, suitable for photography display and spectral physics teaching.Main FunctionDivide the light beam into a variety of spectral components, present the composition of the rainbow, and help children observe the formation of the rainbow.For PhotographyIt can increase the lens flare in the fog. The refracted light displayed by the prism will add mysterious to your photography.Teaching ToolSuitable for the teaching of spectrum physics, to help children observe light, discover the beauty of light, and cultivate children& 039;s physics hobby.Good GiftComes with gift box, which is very suitable for birthday, anniversary, Christmas, Thanksgiving and Children& 039;s Day gifts. We have four size for you to choose.Specifications:Type: Triangular PrismMaterial: Optical GlassColor: ClearSize(Side Length*H): About30x150mm/1.18x5.91inch30x50mm/1.18x1.97inch25x80mm/0.98x3.15inch30x100mm/1.18x3.94inchPackage Included:1pc x Triangular PrismNote:1. Due to the light and screen difference, the item& 039;s color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.