For use with suitable headgear or neck pads. Prevent dangerous slingshot rebound injuries of the facebow in case of disconnection from headgear tubes. Straps are notched with a numbering system as well as a dotted system to show how much pressure is being exerted on the patient. Safety clasps disengage the spring strap when a pressure pull of 2 Kg. on each side is exceeded. Coil springs provide constant attraction force. Available in 3 color-coded attachment straps that show the force level.