Twelve Ball Mat: 12 balls included. Acupressure mat to loosen the buttocks. With a dedicated cover. Outlet item, slightly defective. Health goods. Acupressure points, stretching, muscles, stiffness, buttocks, back, foot massage, loosening stiffness, massage balls, lower back pain, hunchback, swelling, sensitivity to cold, work from home. ‐ Mercari: Shop from Japan