Description This product is a fully equipped optical concave-convex lens prisms set, made of plastic and glass materials, safe and durable, and can serve you well. This kit is mainly suitable for physical optics experiments. It can be well applied to your junior high school physics classroom. It is a very practical teaching tool that can bring fun to children and help them learn better knowledge. Features -Color:Assorted Color, Random Color Accessories -Material:Plastic, Glass- Size: 23.20X16.00X5.30cm/9.12X6.29X2.08in -Made of plastic and glass materials, it is safe to use and durable.-This is a practical teaching tool that can be used in physical optics experiments well.-Creative and interesting, with complete configuration, it can help children learn knowledge while having fun.-This kit can help adjust different lights, creative and interesting, and can well attract children's attention.-It is not only a fun children's toy but also a practical teaching tool kit with a wide range of uses. Packing list: 17 x Optical Experiment Tools