This set includes two 4.4 cm/1.7’’ balls (soft and firm) to precisely target problem areas. They are ideal for self-myofascial release and can also be used in dexterity exercises to increase motor coordination and reflexes. Features & Benefits -Medical Grade Silicone -For Self-Myofascial Release, using a rolling action and body weight -Accesses hard-to-reach trigger points and stimulates the muscle stretch reflex -Can also be used in dexterity exercises to increase motor-co-ordination and reflexes. Trigger balls allow targeted application for stressed areas of the body Tension can be released by targeted pressure Ideal for use on feet, buttocks, hips, back, shoulders and forearms Two different degrees of hardness for specific use depending on the body area and pain limit Compact, perfect for any gym bag