?Fits For?:for 1/10 Arrma 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.