Super ATV's Heavy Duty Ball Joints are extremely durable and will give your RZR the ultimate strength. We offer an OE Replacement ball joint for casual UTV Riding, or a Heavy Duty 4340 Steel Stud Ball Joint for Rougher Weekend Trail Rides, last but not least we have a Super Duty 300M Ball Joints to deliver all-out strength. Each ball joint comes with a greasable zerk for easy access and maintenance. Also features an adjustable steel on steel design for strength and longevity. These work for both upper and lower a-arms. Upgrade your Polaris RZR PRO XP with Super ATV Replacement Ball Joints today!! - Our Super ATV Replacement Ball Joint generally ships out within 1 business day! - Fits: Polaris RZR PRO XP : 2020+ / RZR PRO XP 4 : 2020+ Standard Duty Ball Joints -Stronger Than Stock -Can Withstand 13,000 lbs of Force -For the Casual Rider Heavy Duty 4340 Ball Joints -Stud Thicker Than Stock -Stronger Than Stock -Greasable -Serviceable -Can Withstand 24,000 lbs of Force -For the Weekend Warrior Super Duty 300M Ball Joints -Stud Thicker Than Stock -Stronger Than Stock -Greasable -Serviceable -Can Withstand 29,000 lbs of Force -For the Hardcore Rider Manufacturers Part Number : BJ-1-33-002 , BJ-1-33-001 , BJ-1-33-003