Abstract: Unique, multifunctional, ergonomic, paired, diagnostic, and treatment instruments having one or more knobs designed to simulate the digits of the human hand are provided. These instruments include a variety of curvilinear and linear tissue engaging edges and converging surfaces that facilitate the ergonomic use of these instruments on the irregular contours of the soft tissue areas of the human or animal body. These instruments for Instrument Assisted Soft Tissue Mobilization (IASTM), are to be used for mechanical therapy such as: breaking up soft tissue adhesions, fibrotic tissue, or calcium deposits, tissue massage, deep tissue release, acupressure, joint mobilization, and self-massage. These instruments are designed for treating more than one area of the body and may be used with humans as well as domestic and farm animals. These instruments are ergonomically designed and therefore reduce stress, strain and injury to practitioner's hands and fingers and provide enhanced patient comfort.