This is an exercise product for the neck to lower back, used while lying on your back. By swinging it left and right while applying pressure, it stimulates the muscles of the neck and lower back, improving body balance. It has been stored at home without being used much. As shown in the last photo, the zipper pull is missing. You can open and close it by inserting a pointed tool like an awl into the zipper hole. Please consider this used item with the understanding that it is a pre-owned product. Includes instruction manual. Size: Approximately 25cm (length) x 22cm (width) x 15cm (height). Thank you for looking.