Sufficient Quantity : The set includes 16 whistles to meet a variety of needs for teams , schools or families , great value for money Premium Quality : Made of great metal , sturdy and enduring , not easy to break and deform , suitable for various occasions Adjustable Length : Comes with a lanyard , which makes it easy to hang the whistle around your neck . The lanyard also has a plastic ball that can be adjusted in length to meet your various wearing needs Easy to Carry : Compact and lightweight design , easy to carry around . You can hang it on your key ring or wrist and use it anytime and anywhere Widely Used : Suitable for sports events , outdoor activities , pet training , celebration cheering , teaching and many other scenes . Whether it's a basketball game or dog training , it can clearly transmit instructions