Description:    This set contains 8T pinion and crown gears made from durable carbon-reinforced nylon resin material. Set also comes with a newly designed Super-II chassis rear gear cover which enables quick gear cover attachment/ detachment thanks to a lever. The gear cover is also made from carbon-reinforced nylon resin material.   Compatibility 18T Pinion Gear: Can be used with Mini 4WD and Mini 4WD PRO cars. Crown Gear: Can be used with Super-II, VS, Super TZ-X, Super TZ, Super 1, and Zero chassis cars. Gear Cover: Can be used with Super-II chassis cars.   Specs and Features Reinforced 8T Pinion Gear x 4pcs. Reinforced Crown Gear x 4pcs.s. Super-II chassis Easy Locking Gear Cover (Rear) x 1pc.