17 - 18 * Simply clip Retroback onto the existing sling upholstery and lift it off every time a wheelchair needs to be folded or stored * No tools or hardware needed * This rugged back support system weighs only 3 pounds (1 kg) making it easy to attach and remove from a wheelchair * Includes: Cushioned back support pad with attachment clip cover and instruction manual * The removable water-resistant cover is made of a flexible durable washable fabric * Clip on and clip off * Improves comfort * Supports posture * Weight Capacity: 300 lbs * 12-month Limited Warranty * Medicare Code: E2611 *