The Core-Tex Sit is the perfect solution for anyone looking to improve their posture, reduce stress in the lower back and focus better while working. Manufactured from ABS plastic with a diameter of 14", it has a convex top sitting surface covered with foam padding, making it an ideal choice for any seating arrangement. With its patented motion, it moves on three high precision ball transfers and includes a simultaneous tilt, slide and rotation to help strengthen abdominal muscles and lower back while sitting. Use it on most chairs, the floor or against the wall to get all the benefits associated with these controlled exercises. With adjustable resistance and speed settings as well as multiple applications, you'll experience improved focus, better posture and relief from stress in no time at all.