Hot Racing CSG1813 13t 48p Hardened Steel Pinion Gear 1/8 Bore Made by Hot Racing; Hot Racing is a United States based company; parts are sourced from Chinese producers All Hot Racing upgrade parts are direct replacements for stock components; additional parts are not required Hot Racing part number CSG1813; UPC 083745637588 This item works with: Associated RC-10 T4.x, SC-10 2WD; Axial SCX-10 Scale Truck, XR10 Crawler; Losi 1:10 Desert Truck, 1:10 HighRoller, 1:10 Night Crawler; Traxxas 1/16 Slash/Rally 4WD, 1/16 Summit VXL, Rustler VXL Velineon Brushless, Rustler XL-5, Slash 2WD all versions, Stampede Electric, Stampede VXL, Stampede XL-5