Hot Racing 17t 48p Hard Anodized Aluminum Pinion Gear HAG817 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 HAG817; UPC 083745306736 This item works with: Associated RC-10 B4.x, RC-10 original aluminum chassis, RC-10 T4.x, SC-10 2WD, TC-3 Electric Sedan; HPI Electric Blitz, E Firestorm, E10; Traxxas (Legacy) Bullet, (Legacy) LS-II, (Legacy) TRX-1, Bandit Electric, Rustler VXL Velineon Brushless, Rustler XL-5, Slash 2WD all versions, Stampede Electric, Stampede VXL, Stampede XL-5