This gear kit is comprehensive, containing everything you've been waiting for: axles, tires, gears, and bushings. It includes brass gears, bevel gears, racks, and even 2.3 and 3.17 gears, so you're almost guaranteed to find something useful! It all depends on your individual needs!

 Quantity per pack: 78 pieces; actual types: 71 (because it contains 4 tires and 2 axles of each type, this is for easy DIY assembly).

These are just the accessories we've provided, trying to offer as many options as possible for DIY use. However, you can't use these directly to build a small car. We only provide the car accessories; you'll definitely need your own creativity, such as for the frame, screws, etc.

 This gear kit covers a wide range of items, including spindles, single-layer gears, double-layer gears, crown gears, pulleys, racks, bevel gears, brass gears, bushings, axles, tires, rubber bands, and more.

Unique gears include: 36mm yellow 2mm hole pulley, rack, four-wheel drive stacked gear, 28-tooth 2mm hole sector gear, 30-100mm axle, and 30mm outer diameter five-spoke wheel hub!

 The axle lengths are 30mm, 50mm, 70mm, and 100mm, and the axle diameter is 2mm. There are two of each type.

Five-spoke wheel hub: outer diameter 30mm, inner diameter 2mm, four wheels.

Most gears have a 2mm bore (tight fit or loose fit), except for one 81. The spindle bore is 1.5mm, two crowns are 2.5mm, one crown gear C303A is 3mm, and one 15-tooth gear has a 2.3mm bore and a 3.17mm bore.