For 1/10 RC Traxxas TRX4 TRX6 Brass Counterweight Front /Rear Axle Shell. Features: 100% brand new Heavy duty brass counterweight assembly. Allows precise and easy weight addition to door axles. Added weight and increased stability on difficult obstacles.Suitable for 1/10 RC Traxxas TRX4 TRX6 Specifications: Material: Brass Package List. 1Brass front axle body or 1Brass rear axle car shell.