The TriggerPoint MBX extra firm, 2.6'' diameter massage ball provides deep-tissue compression to encourage blood and oxygen flow to the muscles, helping enhance overall movement, range of motion, and performance. The MBX is ideal for intense compression on the shoulders, hips, and groin. This massage ball features an easy to clean foam surface, weighs 1.4 oz., and is backed by a 1-year manufacturer's warranty.