Description: FunnyLet children learn to master the physical optics of refraction and reflection knowledge easily DIY ExperienceThis kits serve as an excellent educational tool for children to learn about light refraction in a fun and interactive way TheoriesThe physical optics experiment set can clearly show the light from a medium into another medium, the direction of propagation changes, so that the light at the junction of different media deflection phenomenon Perfect GiftThis DIY science kits is a great and practical gift for children to enjoy and learn Package IncludesEach purchase comes with 1 set of Refraction Demonstrator Cylindrical Lens, containing 6 pieces in total. Specification: Material: Acrylic Size Chart: as picture Package Includes: 6Cylindrical Lens Note: 1.This is not infant toy, please take away from children to avoid eating.2.Please allow slightly errors due to manual measurement and different monitors.