Bought for a gift. They're individually wrapped, which I thought was cute, but it turned out most were already scratched. Some to the point where I can no longer use them as gifts. There is an air bubble in one of them. One of the acrylic panels on the back has a black burn mark on the inside, meaning I can't erase it. Inexpensive yes, but that doesn't mean that the products have such flaws. By the way, for those who are still thinking about buying, the inner diameter is 38mm.
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