The Strongest and lightest Drive Shafts available are bonded to 7075 Forged Aluminum tube yokes of our own design. The Assembly is tested under a 1700 FT/lb torque test in both directions to assure the Quality of the Bond and the integrity of the tube. As with all of Precision Shaft Technologies shafts they are balanced as an assembly, to less than 1/8 oz/in for smooth operation. One of the main reasons to use these shafts is safety, they are designed to shred upon impact, and they stay under the car and turn back to fiber. Some sanctioning bodies recommend the use of these shafts. Slip yokes are priced separate.