Material: TPE Diameter: 6.5CM IMMEDIATE BENEFITS - Eliminates muscle knots and tension. Trigger point therapy massage lacrosse balls relieve sore and tight muscles to rejuvenate and revitalize all areas of the body. EASY TO USE - Simply lean on the massage ball and use your own body weight and gravity to relieve muscle knots and tension. MASSAGE ANYWHERE - Perfect for use while sitting on any chair, laying in bed, on the floor, or on a yoga mat. Use them at home, at the office, or at the gym. Small, portable and easy to bring along on any trip