Feature:1. Suitable for gearbox, motor, belt pulley and so on.2. Great for DIY toy accessories use.3. Made of high quality ABS plastic, not easy to deform.4. Safe and non-toxic, rest assured to use.5. Complete specification, satisfy your various needs.Specification:Material: ABS plasticSpindle Straight Teeth(10 kinds): 80.8A 81A 81.5A 82A 92A 102A 122A 132A 142A 182ACrown Gear(11 kinds): C152A C203A C282A C282.5A C303A C322A C20082A C28082B C28102.5B C30102B C40102BSingle Layer Gear(12 kinds): 202A 242A 242A 302A 303A 302.5A 322A 362A 402A 422A 482A 562ADouble Layer Gear(19 kinds): 16102B 18102A 20082B 20102B 22082A 22102B 24102B 24122B 26082B 28102B 30162A 32082B 34102B 38082B 40102B 46082A 48102B 50102APulley(8 kinds): 122B 102B 62A 92A 132A 16.82A 242ABWorm(2 kinds): W6x62A W6x82A 3-Way Shaft Sleeve(1 kind): 3T-2A-2B Bevel Gear(1 Kind): S162A.Package List:10 x Spindle Gear11 x Crown Gear12 x Single Layer Gear19 x Double Layer Gear8 x Pulley2 x Worm1 x 3-Way Shaft Sleeve1 x Bevel Gear