The brass material is durable enough to handle impacts and scrapes without denting or deforming. Whether you're running the TRX4, TRX6, Defender, or Bronco models, these covers deliver both performance benefits and aesthetic upgrades The brass diff axle covers lower and centralize the vehicle's center of gravity, increase the stability. Made of high-quality brass material, high precision CNC machined. Replace original plastic parts and protect the differential axle. CNC Brass Axle Covers TREAL Brass Axle Diff Covers (2P) CNC Machined Heavy Weight Upgrades For 1/18 TRX4M Axle Covers For TRX4M Bronco INJORA 2PCS 11g Brass Front Rear Axle Cover for 1/18 RC Crawler Car TRX4M Upgrade Parts (4M-01) Compatible with: 1/18 TRX4M Defender, Bronco, High Trail K10, High Trail F150 Features: CNC machined brass Replace original plastic parts, easy to install 11g/pcs, add weight to the axle which lower the center of gravity, increase the stability Fit both front and rear axles Specifications: Part... Increase rc car stability, make it an overall more capable crawler. Package List: 2 * Brass Axle Covers Features: Made of high-quality CNC brass material. RCAWD TRX4M Portal Axles & Differential Gear & Servo for 1 Replace original plastic parts and easy to install,suit for both front and rear RC axle.