The best ones I've found are some black ones that have releases built in. I believe they came from U-Line, but I can't remember. We bought probably 5-10 thousand of them at work. They are thick and I've yet to have one of the clips break (where most of mine break). And, when you're done using them, you can release them and re-use. And Yes, the black have UV resistance built in, where the clear, or natural ones, don't. I buy the cheap ones for the house.