Make sure you got it properly and get the features out of the way: 1. Please trim the feathers around their neck before putting them on.2. Place no crow rooster collar lower on the neck.3. Put the collar under the neck feathers and tight enough to only fit one pink finger through . 4.Slowly to adjust and tight it.Package include: 6 pieces pet chicken no-crow rooster collar Remind: 1.Let rooster get use to it at first before tightening it . 2.Routinely check the tightness for your Rooster.