The Original Backnobber II 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, under an arm, around the torso, under the leg or foot 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 36 page User Guide. Proudly Made in the USA.