They stick about 2-3 days, then 1 peels off and then the next day 1 turns out unknown where. No wonder they are sold by the piece. I bought these because I decided I needed real glass lenses for the clarity and durability they offer. But they are heavy, and frame manufacturers and eyewear stores have missed the opportunity to create a comfortable set. You can't get lightweight frameless glass lenses anymore. Lost Talent. It was said that factories could not drill glass without making mistakes. God, they did that over 100 years ago. Think Ben Franklin. In any case, after a few days you will get a sticky substance on the nose and frame. They really help when tied comfortably and sliding down the nose. Here are 2 why 1 star
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