【Fits For】:for 1/10 Granite 3S Blx & Mega550, Senton 3S Blx & Mega550, Big Rock 3S Blx, Vorteks 3S Blx, Kraton 4S Blx, Outcast 4S Blx, 1/8 Typhon 3S,Replace ARA310948 ARA311034 ARA310949. 【High quality material】: Gear Made of high-quality steel material, Hard anodic oxidation and anti-rust treatment on gear surface, long service life for these gears. 【Low Noise】The gear set is with precision manufactured gear teeth for smooth, consistent performance,they works with low noise. 【More Durable】:The upgrades part is durable enough,improves the overall performance of the rc car.Specially designed strengthening cut-outs for increased crash resistance. 【Easy to Install】:great for replace the old or broken part.Increase overall performance and durability of your RC car.