AUCH Different Styles DIY Plastic Gear Shaft Rack Reduction Worm Gears Belt Pulley for RC Hobby Vehicle Toys&pound;&not;60 Pcs Product Name : Plastic Gear Set; Fit for : for DIY Toys Motor Gearbox Shaft Quantity:60pcs Our product includes gear, rack, pulleys, belts, and other transmission parts, and all the display pictures were taken in kind 60 different kinds of parts and accessories in just one package, which makes it a perfect choice for laboratories, science education, DIY models, RC-airplane/helicopter repair, etc. Modulus: 0.5