Science experiment - exploring property of Light Renection & Plane Mirrors Reflection & Image Formation, physics educational for kids children student 3 pieces of plastic mirror pipe and 2 pieces of oval lens, toy Principle: using the principle of double reflection imaging, make children around obstacles to observe the target Student Kids Teaching Aidsthe fun of making and knowledge Kid science development toys, a series of physical science boarden kids and children , stimulating their curiosity Have your child in an early involvement in exploring and , hand-eye coordination, and knowledge curiosity Material: plastic ColorRandom Color Size( Inner Dia): approx 32mm/ 1.25 inch Size( External Dia): approx 40mm/ 1.57 inch Package Includes: 1 Pieces Toy Note: Please allow 1-3mm error due to manual measurement, make sure that you do not mind before you bid. Due to the different monitor and light effect, the actual color may be slightly different from the picture color.