Value Pack of Whistles: You will receive 24 whistles with a lanyard. Enough to meet your use and replacement needs for various activities. The whistle measures 4 cm * 2 cm and the lanyard is approximately 41 cm, which is easy to carry. High-Quality Material: The coach 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, with a range of 120 dB in a short time and less breath than traditional whistles. The whistle has a powerful, clear sound that quickly attracts attention in noisy environments. With Yellow Strap: Our referee whistle comes with a detachable yellow strap. The hanging strap is made of soft nylon. You can hang the stainless steel whistles around your neck, making them easy to carry and use, and relaxing your hands. Wide Application: The sports whistle is suitable for physical education in school, football, basketball, American football, and other projects. Coach whistles can also be used by coaches, referees, teachers, police officers, lifeguards, and so on.