The shade sail itself is a great item.  It does its job of creating a cooler place beneath it so you can work or relax with protection from the sun.  Unfortunately I ordered the shade sail kit that was supposed to come with installation hardware.  The hardware did not come with the sail and several attempts to reach customer service regarding this went without response.  You can install with ropes,  but they will stretch and loosen, while the wire hardware should hold its position.   Each sail has strong metal loops in the corners for hardware or rope.