I'm pretty sure these window nails will keep the birds from hitting the window. Hairpins are beautiful, but they don't last long. One side is paper and the other side has plastic film that you peel off to reveal a cleaner plastic coating that should stick to your clean window. I actually used some water to help the sticky side, but some birds still fell off after a day. It doesn't really help if there are any curls or twists in the chain; it must be absolutely flat. Good luck if you try them. The price is pretty good if they save a bird's life.
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