Yakimasport 100208 Precision Massage Ball Black Properties: precise myofascial release a ball for pressure and precise self-massage of selected body parts suitable for eliminating point tension and mobilizing intermuscular grooves. recommended for precise relaxation of the buttocks (including the piriformis muscle), calves, arms, feet and chest (in women) for use on the floor, wall and table circumference 25.5 cm Material: foam Color: black