Features: - Made of Natural Rubber. - Diameter: 63.5mm - Using this Natural Rubber Trigger Point Ball is like foam rolling; however, it allows for a more targeted and more precise relief to aching muscles. - This Natural Rubber Trigger Point Ball helps to Relieve Knots in Your Muscles that are also known as Trigger Points, which Lead to Myofascial Pain Syndrome. Benefits: - The Trigger Point Ball is a great tool to help release and achieve the melting of minor aches and pains to muscular tissue. - This Trigger Point Ball is beneficial in targeting muscles of the back, neck, hips, thighs, hamstrings, calves, chest, piriformis, and glutes.