These Target Pro Grip Spin Dart Shafts use aerospace aluminium rings to securely lock the flight to the shaft. This ring locking system provides a more consistent and longer lasting grip than the traditional spring ring system. It is the most secure method of locking the flight to the shaft. The tips of the shafts rotate a full 360 degrees so that in coming darts are not deflected away from their intended target. Instead the incoming dart will spin the flight it hits and continue on its intended path.