Vgoohobby Steel 50T Spur Gear 1 Mod M1 Main Gear Compatible with Traxxas 1/5 X-Maxx 6S 8S 1/10 Maxx 4S 1/10 E-Revo 2.0 VXL 1/7 XSuggest to add lubricating oil, it can be reduce the friction between the metal gears The x maxx spur gear compatible with Traxxas 1 5 X Maxx 6S 8S ,1 10 Maxx 4S ,1 10 E Revo 2. 0 VXL ,1 7 XO 1 rc cars. The 50T spur gear made of high quality 45# steel,strong and durable in use. Compact and lightweight design. CNC machined hardened steel construction. Item Name: 50T Spur Gear Part Number:#6448 Material: 45# Steel Module: M1; Number of Teeth: 50T ;