Hot Racing Traxxas Emaxx Brushless 3908 Aluminum Brake Disc RVO21BR02 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 RVO21BR02; UPC 083745867510 This item works with: Traxxas E-Maxx 3908 Brushless, E-Revo 5603 5605 5608, Revo 3.3 5309, Summit