Check the listing for details. 2014 Amazing Physics Teaching Quality Optical Glass Prism 2" 5cm Light. Condition: New – Open box. Listed at 6.86 USD. Specifications: Show your kids a rainbow Material: optical glass, not plastic This kind of Optical Glass Prism can reflects Seven-color sunlight . It can teach children to explore the mysteries of light, stimulate a child's thirst for knowledge, and improve the children's interest of understanding the magic world. Size : 28*28*28*50 MM Material : Bak 7 optical glass Package included: 1*Optical Glass Prism Shipping: Goods sent to the United States for 7-10 days. I will add a tracking number in EBAY and PAYPAL. You can query in the United States Postal Service. Outside the United States We ship worldwide with flat rate shipping by China Air mail(Registration, can be tracked). This international order may take longer to arrive. Normally the shipping time is 15 to 35 business days 。 Return & Refund policy: In all cases, buyers pay shipping fees at their own cost to return products for exchange or refund. We will be responsible for the postage of replacements. Feedback & detailed Seller Rating Please leave GOOD feedback will be automatically left for you when you leave feedback for the purchase ,If you are not at all happy please contact us in order to resolve any problems we do aim to please !!