Medicordz Head Strap Kit provides the tools patients need to perform key exercises to stretch upper back and neck muscles with this complete kit. Includes head strap that adjusts from 20-26in/50-66cm, door mount and 2ft/60cm modular tubing with 1.5-4.5lbs (0.5-2.0kg) resistance. Resistance when stretched 1-3 times original length.Help stretch and strengthen neck to help relieve neck pain or tension.