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The knobs at each of the four legs of the Jacknobber®II 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 hand held massage tool available. Color may be different than pictured depending on availability.