I have bought 2 sets (4 straps in total) of this article. In each application, the rubber separated after about 30 days of use. I didn't put them on my glasses so hard that they shattered. I thought after the first case, so I definitely eased the rest of the usage... same result. Rubber is just rubbish, as is the design. I love leather straps but would not recommend them to anyone.
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