Hot Racing optional upgrade aluminum rear hub carrier uprights for the Traxxas X-maxxYOU WILL RECEIVE:- Two (2) rear hub carriers- Two (2) 23x17x4 mm bearing- Recommended to use a removable-type locking adhesive on screws threading into metal- Upgrades the factory plastic TRA7732, rear hub carrier set- CNC machined 6061-T6 aluminum construction- Triple bearing support (with a added 23x17x4 mm bearing)- Black anodizing for durability, corrosion resistance, and great looks- Replaces the factory plastic components- Secondarily-processed machined beveled edges