Economical Whistle Set: You will receive 24 whistles with lanyards. Enough to meet your needs for use and replacement for various activities. The whistle measures 4 cm * 2 cm and the lanyard is approximately 41 cm, making it easy to carry. High-Quality Material: The coach's whistle is made of high-quality stainless steel, which is safe, durable, and long-lasting. The lanyard is made of soft nylon, allowing you to hang the stainless steel whistles around your neck, making them easy to carry and use. Loud and Clear: Our teacher whistles contain peas that vibrate at a high frequency to produce a louder sound, reaching 120 dB in a short time and requiring less breath than traditional whistles. The whistle has a powerful, clear sound that quickly attracts attention in noisy environments. With Yellow Lanyard: Our referee whistle comes with a detachable yellow lanyard. The hanging lanyard is made of soft nylon. You can hang the stainless steel whistles around your neck, making them easy to carry and use while relaxing your hands. Wide Application: The sports whistle is suitable for physical education in schools, soccer, basketball, American football, and other projects. Whistles for coaches can also be used by coaches, referees, teachers, police officers, lifeguards, and so on.