1. Made of high quality steel to increase wear resistance and extend service life; 
2.Precision CNC machined steel structure, stable and durable; 
3.Perfectly match the original gearbox, easy to install;
5.Motor Gear:11T
6.Package includes: gear*4; 3×6× 2.5 bearing*6; 3×16 pin*2; 
7.Suitable for 1/18 RC Crawler Car TRX-4M rc crawler.