1.The material and look:this is a transmission case which made of aluminum,red, silver, black anodized, very bright colors and beautiful appearance;
2.Machining:this is a CNC machined piece with accurate data and you can notice, each of its parts fits perfectly; 
3.Replace the stock plastic parts, more robust and durable; 
4.Suitable for 1/18 TRX4M rc crawler.