Hot Racing RVO21XG06 Aluminum Axle Carriers w/ Bearings & Carbon Arms (blue) - T 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 RVO21XG06; UPC 083745867428 This item works with: Traxxas E-Maxx 3908 Brushless, E-Revo 5603 5605 5608, Revo 3.3 5309, Summit, T-Maxx 3.3 4909