Features: 1.Convex Lens, Concave Lens, Convex Mirror, Concave Mirror, Triangular Prism, light refraction experiment is more convenient and clearer 2.The curve of the prism is polished and does not hurt the hand. The lenticular lens is transparent, and the convex lens can also be used as a magnifying glass. 3.Lens and prismatic optical glass products are strictly prohibited from throwing and marking. 4.Keep the mirror clean. If you buy a 5 PCS set, you will get a light source pen for free. 5.If you have any question about our products, please contact us. Specification: Material: Plastic Size: Concave mirror: 100mm (diameter) Convex mirror: 100mm (diameter) Convex lens: 100mm (diameter) Concave lens: 100mm (diameter) Triangular prism: 80mm (length)includes:Style prism: 1x prism Style concave mirror: 1x concave mirror Style convex mirror: 1x convex mirror Style convex lens: 1x convex lens Style concave lens: 1x concave lens 5PCS Set: 1x convex lens 1x concave lens 1x prism 1x concave mirror 1x convex mirror 1x light source pen