Create-A-Bed Full Horizontal Adjustable Deluxe Murphy Wall Bed KitTHIS ITEM IS A HARDWARE KIT ONLY. Bed, mattress, or wood components are NOT included.Until now, adjusting a Murphy bed that was "too heavy" or "too light" meant taking the Murphy bed apart in order to add or remove one or more bulky, hazardous metal springs. (Heavy gloves and eye protection were a must.) It's one of the many reasons manufacturers and customers prefer state-of-the-art pistons instead of old-fashioned metal springs.