The optical prisms are made of optical glass material, which have the . It can reflect the rainbow light under the sunlight. A nice equipment for optical science studying. It is also a wonderful gift for children to learn physics . Features -Color:Transparent -Material: optical glass -Size:9.00X2.00X2.00cm/3.54X0.79X0.79in -It comes with the compact size, portable and very handy to use, bring much convenience to you. -Use these prisms to split beam of light into its spectral components, which is clear and efficient. -Create a unique effect in your photo using our prisms, also fit for learning physics experiments, teaching aids. - optical glass prisms. It has extremely high light transmittance and light-refracting characteristics. -Fine workmanship and chic appearance design will ensure the practicality and durability. Package list: 6 x equilateral prisms