Only inexpensive whistle besides Susato available in a wide variety of keys
A favorite of many Irish musicians
One-piece, cylindrical metal tube with plastic mouthpiece, six fingerholes
Mouthpiece has a characteristic "bump" below the window
All keys available in brass with red mouthpiece or nickel with blue mouthpiece. (Some people say nickel is louder and brighter, and brass is a bit mellower and warmer)
Standard key is D
Not tuneable until glue seal at mouthpiece is melted.
