GOGO 10 Pcs Whistle Key Chain Metal Safety Emergency Whistle With Swivel Lobster Clasp PACKAGE & DIMENSION --- Price is for 10 piece. Whistle Size: 8/9 x 2/5 x 2/5 inch. HIGH QUALITY MATERIAL --- 100% made of high-grade steel. Safe, durable and sturdy to use. LOUD CRISP SOUND--- Super loud and clear tone shrills when blown. You can use it easily and effectively at any situation. CONVENIENT TO CARRY --- Comes with a swivel lobster clasp and keyring, you can carry it easily and convenient. It can be easily attached to keys, ID badge reels or belt clips etc. MULTIPLE USES --- These whistles are suitable for party noisemakers, 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.