Backjoy SitSmart Medicore Relief Backjoy Pelvic Support Seat Lower Back Pain Posture Correction Your posture will improve as your pelvis is upright. There are some minor scratches, but I think it can still be used. Please refrain from purchasing if you are not comfortable with used items or are overly sensitive. "Product Description" By sitting on Backjoy, the pelvis and spine are kept in a natural state, balancing the abdominal and back muscles, and creating a normal curve in the spine. - Reduces stress on the lower back and back, maintaining a comfortable posture even when sitting for long periods. - Medicore Relief's design shape can accommodate a wide range of users, from those with small to large buttocks, in a single size. Non-slip processing is applied to prevent sliding forward. - Recommended for those who want to reduce lower back strain, those who are heavier, those with a sturdy build, and those who seek stronger support. - The thickness of the surface material has been doubled for even better and more comfortable seating! - Unlike simple cushions, it is made with APS technology and special materials, designed as a device that allows you to sit in a naturally correct posture. - It can be used on hard chairs, soft chairs, and even the floor, and it is resistant to high temperatures, making it excellent for use in car seats.