The Mikasa Pulmaster whistle is expertly crafted for effortless blowing, emitting a clear, high tone that can cut through the noise of a spirited crowd. With a lightweight design that won't weigh you down during extended games, this whistle has been approved by FIVB and features an easy-to-blow design with a pea inside, as well as a convenient tether. Weighing only 5.2 grams, it's the perfect choice for referees and coaches.