I saw these on FB and ordered them because I wanted to easily tell my chicks and ducklings apart! Catching her was the hardest part. The "tensioner" - the little balls that the band is pulled from were the perfect thickness to be pulled taut and then stay in place. I tightened it then trimmed off the excess and they were worn for about 4 weeks. After a few hours neither chickens nor ducks bothered them. I name them by the color bar. Now I can tell who does what! Very effective for my purposes.
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