This is an Integy Metal 50-Tooth Spur Gear for the 1/10 scale Traxxas Stampede 4x4 and Slash 4x4. Tired of stripping gears in your 1/10-scale Stampede 4x4 or 1/10-scale Slash 4x4? Integy's Billet steel spur and pinion gears are made to handle the abuse, and will keep you on the road (or off the road!) for whatever type of driving or racing you are doing.