Package:2pcs Optical Glass Triangular Prism 9cm/3.5inch Crystal Rainbow Maker Material:optical glass Size:approx 9cm/3.5inch in length,2cm/0.8inch in side length Made of premium optical glass, the triangular prism is crystal clear for you to use this equilateral prism to split a beam of light into spectral components. The Triangular Prism is not only clear,beautiful and can be a decoration.But also can provides rainbow color light effects for you to take unique photos.Show wonderful rainbow optical effects for your kids or students, so you can explain these great natural sciences to them. Use this equilateral prism to split a beam of light into its spectral components (the colors of the rainbow).Show your kids a rainbow, or use our prism for photography to create unique pictures.