ST Racing Concepts have introduced new aluminum diff covers for Traxxas TRX-4. The diff covers for any scale rig is the focal point of the front and rear drive axle. These diff covers adds a bit more weight to the front and rear drive axle for better climbing performance while provides incredible looks to your TRX-4. Easy to install, simply remove the stock plastic piece and replace. Available in brilliantly anodized blue, black, gun metal, red and silver.