The Cannon Sports whistle features a high impact, durable plastic body with a cork ball inside Attaches to your favorite lanyard or car keys with a keychain ring that’s included: easy to install Measures larger than your average whistle, with a length of 2.25 inches, making it great for adults Control the game with a loud whistle perfect for being heard out in the field or in the gymnasium Choose from a classic referee black or a deep red color, both made with long lasting materials