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Product Name: seventy eight Kinds of Plastic Gear Bag Toy Car Accessories Gear kit contains: spindle gears, single layer gears, double layer gears, crown gears, pulleys, racks, bevel gears, copper gears, bushings, axles, tires, rubber bands, etc. Axle(8pcs): Lengths: 30mm, 50mm, 70mm, 100mm(2pcs of each size) Axle diameter: 2mm Five-spoke hub wheels(4pcs): Outer diameter: 30mm Bore 2mm Most of the gears are 2mm bore (tight match or loose fit), apart from 1 81. spindle bore which is 1.5mm, 2 crowns which are 2.5mm, 1 crown equipment C303A which is 3mm, and 1 15-tooth with a 2.3mm bore and a 3.17mm bore. Quantity: 78, the particular type: seventy one forms (because inside the tire 4, axle every single type of 2, this is to facilitate DIY production) Pack Quantity: 1 Pack(78pcs)