JK Rubicon CV Joints are made from air craft quality steel. These front axle shafts are the strongest upgrade for your Rubicon ever. These CV joints are the same successful technology as the Dana 60 CV. Everyone knows the CV joint is much smoother at full turn than a u-joint with no knuckle bind. They also come with a high durometer urethane boot to protect against debris and water. Of course they come with RCV's "You break it, we replace it" warranty!