I have no idea how to rate that. I'm sure it's FIVE STARS BUT IT'S MY FAULT I didn't take a closer look at the picture on the product. My Costa sunglasses have very large temples, like most of my Costa sunglasses. These straps have a very SMALL plastic end that the arm attaches to, so be careful. Your Costa glasses have a VERY small tip on the temples. Almost like a sharp end to slip into the shoulder straps. NOT AMAZON'S FAULT. I JUST DID NOT LOOK AT THE PHOTO ENOUGH ENOUGH.
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