Hot Racing Vaterra Twin Hammers Aluminum 48p 78t Spur Gear VTH78H 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 VTH78H; UPC 083745834956 This item works with: Vaterra Ascender 1:10 Chevrolet K5 Blazer, Twin Hammers 1.9 Rock Racer RTR