【Fits For】: for 1/10 Big Rock 3S BLX,ARA4312V3,ARA102723,ARA102711,Granite 3S BLX (Mega550) ARA102666,ARA102720,ARA4202V3,ARA4102V4,ARA4202XV3,ARA4302V3,ARA102714,Senton 3S BLX (Mega550) ARA102668,ARA102721,ARA4203V3,ARA4103V4,ARA4203XV3,ARA4303V3,ARA102715,1/8 Typhon 3S BLX (Mega550) ARA102696,ARA102722,ARA4206V3,ARA4306V3,ARA102694. 【High quality material】: The Transmission Case Gearbox Alloy Anodized of 6061 anodized aluminum, precision CNC machined, lightweight and durable, increase crash resistance and long-lasting durability. 【Long-lasting Performance】: The rc car upgrades parts highly increase the strength and precision. 【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.