Package Included: 4pcs stainless steel whistle with black lanyard.Size:4.2 * 2.0 * 1.5cm Material:100% stainless steel referee, coach whistle, durable & permanent; smooth surface, comfortable touch,much better than the plastic. Convenient & portable: Comes with a black lanyard, easy to carry, or only wear it around your neck Easy to use: cork pea makes it easy to blow a loud Application: Suitable for referee, coach, lifeguard, training, self-defense, school sports, competition, emergency, or anyone who needs a safety whistle.