Material: ABS+304 stainless steel+gel liquidThis massage ball is filled with special liquid and passed through a special sealing process. The massage ball can massage the shoulders, back, waist, legs, arms, etc. It has the functions of relaxing muscles and promoting blood circulation, and relaxing muscles. [Product size]: base diameter 8.5cm, height 7.5cm, ball diameter 7cm[Net weight of massage ball]: 260gThe sphere can be used for more than 6 hours after being iced for 2 hours. The sphere of the product is always very low temperature, cold, and ice. It has a good physiotherapy effect for athletes or fitness enthusiasts. It can also be used for hot compress massage. It can be used by soaking in hot water for 15-20 minutes. It is currently used in basketball NBA and European football clubs. It is deeply loved by athletes and physical therapists. It has a good recovery and health care effect on muscle strains, hamstrings, and poor blood vessels.