Quantity:1pcs.Material: optical glass.Color: Transparent.Type: Physics teaching tool.Triangular prisms are used to disperse light， that is to break light up into its spectral components (the colors of the rainbow).Show your kids a rainbowSize:5x 3x 3cm.Net Weight: Approx 51g.Easy and convenient to use.Package Include: 1 x 5cm Triangular prisms .