GOGO 10 Pcs Plastic Sports Whistle With Breakaway Lanyard Coach Whistles PACKAGE & DIMENSION --- Price is for 10 pieces; Package: 1 piece / individual plastic box. Whistle Size: 2 x 2/3 x 4/5 inch; Box Size: 3-1/3 x 1 x 5/7 inch. HIGH QUALITY MATERIAL --- 100% made of high-impact ABS plastic; Natural cork ball; Nylon detachable neck lanyard; Metal lanyard ring. Safe, durable and sturdy to use. LOUD CRISP SOUND--- Whistles with a pea are just easier to use. The pea affects the flow of air, creating a loud shrill with less air pressure. Perfect if you're a little out of breath. The prime whistle has a loud crisp sound. You can use it easily and effectively at any situation. CONVENIENT TO CARRY --- Comes with a lanyard, you can carry it easily and convenient. The lanyard of the plastic whistle is attached by a metal ring. You can wear it around your neck. And it can be easily attached to keys, ID badge reels or belt clips etc. Keeps it securely in place while wearing during any activities like coaching, refereeing, or lifeguard. MULTIPLE USES --- These whistles are suitable for referees, coaches, training, teachers, lifeguards, self-defense, survival, emergency, herding, training bird or dog, gym, school sports training, basketball, soccer, football and other sports, or anyone who needs a safety whistle. Also fit for Law Enforcement, Park Rangers, and Emergency-Hiking-Survival for outdoor activities.