Helps give your hands a break when they are tired from massaging! The Jack Knobber is easy and fun to use - massage yourself or massage your friends! The knobs at each of the four legs of the Jacknobber can be used in many ways to apply deep pressure to muscular trigger points and tension. The smaller knobs provide more intense pressure while the larger knobs provide a gentler pressure. Use one knob at a time to press deeply into imbedded trigger points; use two knobs at a time on either side of the spine. Product is made of durable metal with natural wood knobs. Colors vary.