This Joerex Plastic Whistle With Kernel is very handy and very stylish??.?? With any coach that may be running around with their players??,?? this the ideal whistle to use.?? There??'??s now no reason not to control the game in a professional manner.?? For all referees who wish to have control of any game, the Joerex plastic whistle with kernel is the tool you need. No matter what sport you coach??,??this plastic whistle features a bold??,?? crisp sound each time you use it.