Descriptions: Made out of high-density EPP foam which is non-toxic, easy to clean, and capable of supporting up to hundreds of pounds of body weight This massage tool can help you to relieve tense muscles in shoulders and necks, as well as to promote blood circulation Massage function: It has good effect when massaging your acupuncture points or the trigger point of injury Correct body shape: When you are using a yoga ball, all parts of your body are constantly adjusted slightly to keep you stable Portable: Small in size, light weight, easy to put in your luggage Suitable for the office staffs, athletes, children and women etc.