Therapy Myofascial Release Relieves Muscle Knots and Tight Muscles Recovery and Rejuvenation of Sore Muscles Relieves Stress and Tension Alleviates Cramps and Generates Blood Flow and Increases Flexibility Perfect for Yoga Therapeutics size:10cm Material: EVA colour:black Package Contents: 2 x Fitness Ball Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Perfect for use while sitting on any chair, laying in bed, on the floor, or on a yoga mat. Use them , at the office, or at the gym. Small, portable and easy to bring along on any trip. firm enough to support all body types without losing shape after regular use. Best massage therapy balls that hit the spot and offer an unparalleled sense of relaxation and full body relief. They can effectively loosen your muscles in any part of your body like: back, shoulders, neck, buttocks, feet, hips and thighs! High Density Firm Foam - that is easy to clean. Perfect for massage, balance, strengthening, flexibility, muscle re-education and rehab exercises.