Trüpower Motorsports Polaris AXYS RMK ASSAULT 800 Premium Direct Replacement Upper Control Arm Spherical Bearings are manufactured to meet or exceed OE specifications following rigorous quality control and product stress testing. Our bearing kits stabilize the suspension system so your sled continues to perform the way it was meant to perform. Plain and simple, our Polaris AXYS RMK ASSAULT 800 Upper Control Arm Spherical Bearings are built to last so you can work hard and play even harder.