Features: Brand new and high quality Interesting science and education works, exercise manual brain ability, show hand cranked electricity. This is a good way to teach and learn about generating electricity. Let your creativity flow as you explore world of science through this educational toy. This DIY hand crank kits is a fascinating educational toy that allows children to experience the principles of electricity. Perfect for students, educators, and science enthusiasts who are interested in hands on learning. Specifications: Material: Wood Size: about 15x8.5x12cm/5.91x3.35x4.72'' Package Includes: 1 Set Hand Crank Generator note: Please allow 1-3cm errors due to manual measurement. Due to difference betweeen different monitors,the picture may not reflect the actual color of the item.