These sunglasses were purchased over 10 years ago at Chrome Hearts Ginza. They are quite sturdy. A lot of silver is used, and I don't think there are any current products that use such a lavish amount of silver and are this robust. There is a receipt, though it's quite faded. Although they are quite old, I have stored them without wearing them much. They use Carl Zeiss lenses, and the view is clearer and more vivid than with the naked eye. Upon opening the case for the listing, the rubber dagger broke due to deterioration. I'm listing about 3 pairs of unused Chrome Hearts glasses, and when I opened the cases, all the rubber daggers broke off, so it's definitely something that will break down with age. Rest assured, these are definitely authentic. There are no particularly large scratches on the lenses, but if you are concerned about minor scratches, please consider replacing the lenses.