This is an optional Hot Racing 32 Pitch, 54 Tooth Aluminum Spur Gear for use with the Traxxas Jato 3.3, Rally VXL, Slash 4x4, Stampede 4x4 and T-Maxx 3.3 with slipper clutch transmissions. Features: CNC machined 6061-T6 aluminum Direct fit replacement for vehicles with slipper clutch transmissions Hard anodized with light gunmetal color Light-weight 0.8 module pitch (compatible with 32-pitch) Specifications: Outer diameter: 44.8mm Thickness (face width): 6mm