Use this equilateral prism to split a beam of light into its spectral components (the colors of the rainbow). Side Length: 1.38 inch or 35mm, Wider than most other prisms on the market. Makes them easier to hold and use. Show your kids a rainbow, or use our prism for photography to create unique pictures. Material: Lead free K9 optic glass, not plastic. Our products are made with the highest quality materials and are designed to provide you with the best possible user experience. We strive to ship out all orders within three days of purchase, and the estimated delivery time is 8-15 days.When shopping, please pay attention to the size and dimensions of the product to ensure that it meets your needs. In the title and , we have provided detailed information about the product, including its features and specificationsWe want you to be completely satisfied with your purchase, so if you have any questions or concerns, please don''''t hesitate to . We are here to help and will do our best to assist you.Thank you for choosing our product. We hope you enjoy it Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.