Special Massage Ball: Our trigger point massage ball is made of thermoplastic rubber (TPR) and measures 7.6 cm in diameter. Our massage ball is designed to provide a super deep tissue massage with its unique, non-slip tread. It offers three different patterns to help you relax. Extra strong: Specially designed to be firm, the 7.6 cm massage ball is the perfect firmness to get a fantastic deep tissue massage. You can even put your entire body weight on the massage ball. Deep Tissue Therapy: The massage ball is perfect for plantar fasciitis, sore muscles before and after exercise, and soreness left on the lacrosse ball site - creates higher global shear pressures for an intense, effective, and efficient type of deep tissue therapy. . Unique Massage Pattern: Our massage ball offers an alternative to traditional foam rollers and massage balls, with some round trigger points for deep tissue therapy, some square trigger points for tissue therapy and rectangle for light relaxation.