The Original Backnobber II massage tool is constructed of durable, fiberglass reinforced nylon and carries a full satisfaction guarantee. It 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 and comes with a fully illustrated user guide. Comes blue in color and is proudly made in the USA.