The optical set is professional and practical. It is a great physical and optical experiment tool. It can provide children with a more relaxed and joyful learning method and help children to better the principle knowledge. It is a very practical tool kit. It is well used for boring teachers or as children's educational toys. Features - ColorAssorted Color - Material: Plastic. - Size: About 46.00X2.00X2.00cm/18.08X0.79X0.79inch. - Preferred plastic materials, , safe, durable and practical. - It has good process details, good texture, durable and wear-resistant, and will not be easily . - The set of experiment tools are easy to carry and store, making it convenient for you to experiment. - This is a very practical tool kit, which can be well applied to physics teachers and provide students with a more relaxed and environment. - You can buy this professional and practical optical kit at an . Package list: 1 x set of optical experiment tool kit