The Knotty Tiger® Knot Buster® from Tiger Tail USA is a hand-held muscle knot tool that delivers “elbow deep” pressure and can “dig” into some of the tough, tight muscles without the hard work. The design fits perfectly in the palm of a hand to save fingers, thumbs, and hands from fatigue. Three trigger point curves to apply differing amounts of pressure. Non-slip grip feature. Hard, firm, and smooth surface glides over the clothing. 2.75″ massage surface.