First 4 hole whistle I could find. Made it for someones birthday.

The lanyard hole fits standard paracord for easy attachment to items.

Very loud!
Make your own by creating a circular array around a singular whistle, then connect the tangents and make a larger mouthpiece for the best airflow.

Prusa

i3 MK3

No

No

.2

15%

** Made with a Prusa Mini