As you blow not only do you get a piercing whistle but the little windmill at the end spins round alarmingly fast - very satisfying...
These bird whistles are 8cm long and a different colour on each side.
This is not a consistent arrangement - there are many colour combinations..
If you have a particular colour like or dislike - let me know and I will accommodate your desires.
Oh, and they have MADE IN HONG KONG stamped on the side - so made sometime in the 60s or 70s.