I love these window nails. They separate easily from the sheets, except for a few pieces that I had to carefully clip from the sheet they are laying on. I made sure to wash the windows as directed before installing them. No problem sticking them to windows. I have bird feeders so the birds started hitting my windows again when my perennial window chains fell off (due to the sun hitting them over the years). After placing them on the windows, the bird stopped "knocking". The only caveat here is that I wish there were more griffins.
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