Description 1Made of high quality plastic, wearable and long service life 2These products are for toys gear pulley and other spare parts, suitable for DIY model technology production 3There are six different set for your option including many kinds of gear parts and you can find one that better meet your need 4Small parts, easy to use, great model making accessories for all kinds of cars, robots, etc 5They are also good replacement of old or broken partsDescription: If you are a model amateur, you would know that gears, pulleys and worms are essential and necessary parts for models. Aircraft, automobiles, boats, robots and other small production of science and technology will all need to use those parts. Here we provide many gears of different sizes and many other accessories which may meet your basic needs for model making. They are also good replacement of old or broken parts. Features: Made of high quality plastic, wearable and long service life. These products are for toys gear pulley and other spare parts, suitable for DIY model technology production. There are six different set for your option including many kinds of gear parts and you can find one that better meet your need. Small parts, easy to use, great model making accessories for all kinds of cars, robots, etc. They are also good replacement of old or broken parts.Specifications: Main Material: Plastic Type: 34kinds, 60kinds, 64kinds, 75kinds, 80kinds, 85kinds(optional) 34kinds: Aperture Diameter(mm)Outside Diameter(mm)Pitch Diameter(mm)Thickness(mm)8Teeth1.9544.810Teeth1.965610Teeth1.9659.0710Teeth2.465516Teeth1.998520Teeth1.911101.5Double Layer20/101.911/610/51.5/3.5Double Layer20/102.011/610/51.5/3.524Teeth1.913121.530Teeth1.916151.530Teeth2.416151.5Double Layer 30/10216/615/51.5+3.532Teeth1.917161.532Teeth2.917162.5Double Layer 32/101.917/616/51.5+3.85Double Layer 32/102.017/616/51.5+3.85Double Layer 32/20217/1116/101.5+3.9336 Teeth Eccentric Gear1.918201.5Double Layer 46/10223/623/51.448 Teeth1.925241.548 Teeth2.425241.556 Teeth1.929281.5Single Layer 80 Teeth1.941401.8Single Layer 120 Teeth1.961601.8Sector Gear 28 Teeth1.929281.8Rack 83 TeethInner diameter 2.05-2.55mm, length 125mm, width 4mm, thickness 7mmCrown Gear 83 Teeth1.9Crown gear outer circle diameter 12.652.9+3.85Worm1.9Diameter 5.9, height 9Worm1.9Diameter 5.9, height 6.75Pulley1.9Slot inner diameter 4Outer diameter 5.4Slot width 2Pulley1.9Slot inner diameter 5Outer diameter 9Slot width 2Pulley1.9Inner diameter 13Outer diameter 16Slot width 2Pulley1.9Inner diameter 12.5Outer diameter 18Slot width 2Pulley