Trüpower Motorsports Ski-Doo Summit, Renegade Premium Direct Replacement Upper Ball Joints are manufactured to meet or exceed OE specifications following rigorous quality control and product stress testing. Trüpower upper ball joints will stabilize the suspension system so your sled continues to perform the way it was meant to perform. Plain and simple, our Ski-Doo Summit, Renegade Upper Ball Joints are built to last so you can work hard and play even harder.