Majic Bubble Massage Orthopedic Lumbar Support Seat Cushion with Magnets for Car, Home and Office, Black 8 strategically placed magnets help to relieve stress points in the shoulder, back, seat and legs 90 soft molded foam bubbles stimulate circulation and improve posture Allows air circulation to keep you cool and provides a massaging effect while you sit Elastic strap keeps cushion in place Lightweight and washable surface