Description • 34 different types of parts and accessories in one package, making it a perfect choice for laboratories, science education, DIY models, airplane/helicopter repair, etc. • Our product includes gears, racks, pulleys, belts and other transmission parts, and all display pictures were taken in kind. Specification: • DIY science and small production, product design, mechanical model • Material: plastic • Colour: White • Quantity: 1 set, 34 types (41 pcs)