These are muscle release tools, specifically designed for myofascial release and deep tissue massage. It is intended to target areas such as the upper back, shoulder blades, back, and hips, providing relief from pain and tension. They were a gift that we never really used. In great condition. Helpful information: * Ergonomic design for total relaxation. � * Offers a professional-quality massage, replicating techniques for precise pressure and effective pain reduction. � * Can be used to relieve pain or tightness in the psoas, neck, shoulders, and spine. � * Features adjustable placement settings and various attachment heads to mimic a therapist's hand, elbow, or thumb. � * Compact and portable design for use at the gym, office, or while traveling. � * May help alleviate muscle knots and improve mobility.