Hot Racing NSG823 23t Steel 48p Pinion Gear 5mm or 1/8 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 NSG823; UPC 083745633030 This item works with: Associated SC-10 2WD; Axial Wraith 4WD Rock Racer RTR; HPI Electric Blitz; Losi 1:10 Strike, 1:10 TLR 22 2WD Buggy; Traxxas Rustler VXL Velineon Brushless, Rustler XL-5, Slash 2WD all versions, Stampede Electric, Stampede VXL, Stampede XL-5