Hot Racing 21t 48p Hardened Steel Pinion Gear 1/8 Bore CSG1821 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 CSG1821; UPC 083745669343 This item works with: Arrma 1:10 Granite Monster Truck, 1:10 Mojave Desert Truck, 1:10 Raider 2WD Buggy, 1:10 Vorteks Stadium Truck; Associated Apex Touring V-Type, B44.x, ProLite 4x4, RC-10 B4.x, RC-10 B5 and B5M, RC-10 B6, RC-10 B64 4wd, RC-10 B64D 4wd buggy, RC-10 B6D, RC-10 original aluminum chassis, RC-10 T4.x, RC-10 T5, RC-10SC5M Short Course, SC-10 2WD, SC-10 4x4, SC10B Buggy, TC-3 Electric Sedan, TC-7 Sedan; Axial AX-10 Deadbolt, AX-10 Ridgecrest Crawler, EXO 4WD Terra Bug