They work well! I ordered them for an Irish theme party. I've attached the large ones to windows and mirrors, and the small ones to our drinking glasses (tall, pint, and wine glasses are all smooth, unstructured glass). I decorated about 24-36 hours before starting and removed 12-24 hours after the party - the fasteners held up the whole time and most went back to the original sheet for future use. They gave a festive look without having to spend a lot of money or buy new glasses.
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