Koshirecchi is a compact acupressure device that loosens the muscles around the "sacrum," which is at the center of the pelvis, and corrects its misalignment. By lying on your back and placing it under your hips, and gently swaying from side to side for about 30 seconds, you can expect effects such as caring for the sacroiliac joint and lumbosacral joint, and making your lower back feel refreshed and lighter. <How to Use> - Lie on your back and bend your knees. - Place Koshirecchi on the center of your hips (sacrum). - Gently sway from side to side for about 30 seconds to stimulate the muscles. ● Material: Main body: ABS resin, polyurethane Main body cover: 100% polyester ● Product size: W15.5×D12×H7cm ● Weight: 139g ● Color: Red I used it frequently for lower back pain, so there are some minor stains. Although it is a used item, it is in good working condition and is recommended for those suffering from lower back pain. Please note that only the product is included; there is no box or instruction manual. Thank you for looking.