I am selling this item because I bought it in August but no longer use it. I have only used it two or three times. I think this is a product that you can still use. By using this item, you can reset your shoulder blades in just 10 seconds by simply lying down! This is a full-fledged stretching device supervised by a chiropractor. ◆ Replicates the techniques of a chiropractor, and gently presses the back, which is difficult to loosen on your own, by swaying back and forth. ◆ Comfortably stretches with 18 protrusions that thoroughly loosen the shoulder blades and surrounding muscles, and a curved shape that supports the back. ◆ By swaying from side to side, it applies moderate pressure to areas that are difficult to reach, powerfully loosening them. Please understand that this is a used item that has been stored at home and inspected by an amateur, so only those who understand this are welcome to purchase.