Optical Glass Prism Diy Reflection 50mm x 50mm Description this kind of optical glass prism 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:1*optical glass prism,the images represent actual product though color of the image and product may slightly differ.