The knobs of the four legs of the Jacknobber™II massage tool 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. Arguably this is the most satisfying and easy to use hand held massage tool available.