I use these to secure my 8ft 10 x 10ft folding umbrella in windy conditions. These straps are the right length and strong enough until they get strong. I mean, sun exposure destroys them pretty quickly. I had about two months of use before they started breaking with normal tightening. I would say that after 2 months in the sun they lost 90% of their strength. But they are so cheap that I just bought a new pair and now I change them more often. However, I wouldn't trust them on the roof of my car, even a brand new one.
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