OBKJJ Coach Whistle,35Pack Football Referee Whistle with Lanyard for Emergency Sports Training Referee

Quality: Stainless Steel Whistles?Made of durable stainless steel, never gilded, durable, suitable for competition in various environments Easy to use: The separate design of the lanyards makes it easier to use, disassemble them for easy access and quick storage. Adapt to the crowd: they are all necessary tools such as coaches, referees, physical education teachers, rest workers, lifeguards, etc Packing: 35 packs Scientific voice?Whistles with a pea are just easier to use,It's science! The pea affects the flow of air,Creating a loud shrill with less air pressure,Perfect if you're a little out of breath