The Original Backnobber II by Pressure Positive is a high quality massage tool is constructed of durable, fiberglass reinforced Nylon and carries a full, satisfaction guarantee. The Original Backnobber II is used by hooking one of its curves over a shoulder or under an arm and using its leverage to apply firm, deep pressure to knots in the muscles of the neck, shoulder, upper and lower back and to nearly any other location where muscle soreness may occur. It can be broken down for easy travel and storage. Comes with a fully illustrated 36 page User Guide. Proudly Made in the USA.