Karman Wheelchair Headrest Universal for 16" to 18" Seat: Universal headrest is compatible with any wheelchair with 7/8" tubular frame Installation instructions included for easy mounting Patented folding headrest design wheelchair accessory is sold in more than 22 countries Mounts easily on to any wheelchair's back handles No need to remove when folding wheelchair Ergonomic molded head cushion adds comfort Extended arms allow for compatibility with wheelchairs with seat width 16"-18" Headrest for manual wheelchair provides head stability Available in small, regular and large size to fit various seats