Features: 1.Complete gearbox, gear inside. Fine workmanship and perfect style. 2.Improve your cars' performance. Smooth and durable. 3.This is a reverse-transmission gearbox gear assembly, non-market other cheaper positive-passing gearbox gear assembly. 4.Backpropagation can effectively eliminate the axial effect and enhance stability. 5.If you have any question about our products, please contact us. You will get a full refund or free replacement if you're unsatisfied. Specification: Material: Metal Size: 150x90x40mm Suit for: 1/10 remote control car SCX10 model Package List: 1x Gearbox