Description: Transparent Casing: The mini generator toy features a transparent casing that allows students to observe the internal gear structure, providing a clear view of how mechanical energy is converted into electrical energy Material: Children hand generator toy is made of pp material, which is sturdy and wear resistant, great educational tool for kids Easy to Assemble: The Science experiment hand crank generator toy is easy to assemble, suitable for kids and adults, which can improve imagination and creativity Function: With this science experiment toy, your child will be able to variety of creative experiments that help them find the world of science and engineering Feature: This innovative generator model is a great concept teaching tool that teaches kids about energy conversion, physics in a fun and interactive way for childdren Specification: Material: PP   Size Chart: 7.5cmx4.5cmx8cm/2.95inchx1.77inchx3.15inch Package Includes: 1 Set Hand Generator Toy Note: Please allow slightly errors due to manual measurement and different monitors.