Upgrade your Polaris with these Two (2) 4130 Chromoly Alloy Steel Heavy-Duty American Star A-Arm Ball Joints. These press-in ball joints are made from high-quality alloy steel and offer features like grease-ability and easy replacement. The package includes a lock pin and nut to make installation a breeze. With a manufacturer warranty of 3 months, you can be assured of the quality and durability of these ball joints. These Ball Joints are 4 to 5 time stronger than your OEM Polaris ball joints. Made in the United States, these ball joints are a perfect fit for your Polaris and will enhance your off-road experience.