I bought a shade sail from this company and the wire clamps that came with it were faulty. A day after I tightened them (smoothly), I tried to loosen them since the sail had some wrinkles in it because the cable was a bit too tight. I could not loosen one of the nuts from each of the wire clamps. I'm pretty mechanically inclined so I tried a variety of different things but they wouldn't budge. I contacted them through email and was in communication with Norma who talked to her manager and suggested I try alternating back and forth between each nut as I unscrew them which I had already tried. They also suggested I try some WD-40 which I was confused by seeing as they were brand new installed only one day prior. If that didn't work, they suggested I cut them off. When I replied back asking if they could send me new wire clamps, I received no response. I followed up again and no response. A set of two wire clamps from them costs a grand total of $2.95, yes two dollars and ninety five cents. I can't imagine trying to get a reply regarding an issue with an actual shade sail. My order was over $500 but they couldn't even reply to me about two faulty wire clamps worth $2.95. Go with another company who will actually be responsive should you have any issues. Good shade sails aren't cheap. Several of our friends have asked about our shade sail but I definitely won't be recommending Tenshon. Also, I'm on the budget and planning committee of our church and we were looking into purchasing several commercial sized shade sails. We'll definitely be looking elsewhere.