* Sporting whistles are made from metal with nickel plating or from plastic in various colors.
* The plastic whistles are inexpensive.
* For special occasions: 14 karat gold whistles.
Electronic Whistle
There are electronic whistles that produce sound consistently without the user blowing the whistle. Electronic whistles that are capable of producing multiple whistle tones are also available.
Cheering Whistle
Cheering whistles in various shapes like football, basketball, etc. in multiple colors and designs are available for promotional or entertainment use by the audience.