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Glass Prism for Stunning Light Refraction and Decor vernier caliper reading Don’t compromise on quality whenGlass Prism Diy Reflection Prisms Equilateral Prism, 50 X 50 Mm glass prism diy reflection prisms equilateral prism 50 mm x 50mm size, product description, description , this kind of optical glass prisms can reflect 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 : 50*50*50*50 mm package included: