1.HARDER, FIRMER THAN REGULAR LACROSSE BALLS. Our massage balls are made of high grade non-toxic TPR material, built to last. Compared to common 2.5″ lacrosse ball, massage ball is slightly smaller (2.4″) but much harder, with non-slip textured surface, provides perfect firmness for trigger point release and deep tissue massage. 2.PHYSIOTHERAPY BALL FOR IMMEDIATE BENEFITS. The trigger point ball relieves sore and tight muscles to rejuvenate and revitalize any area of your body. They are a quick and convenient item for easy pain relief and myofascial release, can be used for foot, back, shoulders, legs, and other body areas. 3.EASY TO USE. Simply lean on the firm massage ball and use your own body weight and gravity to relieve muscle knots and tension. Perfect for use while you're up against the wall, sitting in a chair, lying in bed, on the floor, or on a yoga mat. You can use anytime, while walking, traveling, in the office, in the school, watching TV, listening to the music, during a call, etc. 4.SUITABLE FOR EVERYONE. The myofascial release ball helps relax muscle tissue, reduce soreness and fatigue, improve body flexibility. It is a self-massaging tool to aid in rehabilitation and muscle recovery, practically suitable for everyone, especially for athletes, fitness trainers and desk workers alike.