The Trigger Point Performance TP-Factor Massage Ball is bigger and firmer than our original massage ball and will not lose shape. The ball mirrors the pressure of a forearm for a firmer massage and its primary focus is to relieve muscles of existing minor aches and pains by applying pressure. This tool can be used anywhere on the body including those hard-to-reach areas. Apply pressure with the ball by using the floor, wall, or any hard surface to stabilize movement of the ball. In order to get deep into the muscle the ball has to remain still with an ample amount of pressure for five to seven seconds, at which time the material changes shape. The TP-Factor Ball is great for the neck, shoulders, back, chest, piriformis, calves, or anywhere that you have minor aches and pains.