Carli Extreme Duty Upper & Lower Ball Joint Combo Set (2003-2013 Ram 2500/2003-2012 Ram 3500)The last ball joint you'll ever buy for your Dodge Ram, the Carli Extreme Duty Upper and Lower Ball Joint Kit The ball joints start out as a chunk of specialty chosen material which is machined to Carli's unique design and then heat treated to a specified rockwell (hardness). From there, the ball joints head to an aero space lube company where a proprietary dry lube coating is applied to a specified thickness. And of course, they are topped off with