3″ Aluminum Shafts are built under the most Stringent Tolerances in the industry. Tubing is Factory Straightened to .010″ total runout at the center of the tube. Tube yokes are welded to within .006″ runout on each end. The shafts are Electronically Computer Balanced to less than 1/8 Oz/Inch. Slip yokes are priced separate.