BRASS WHISTLE - This safety whistle is a unique piece of history that is beautifully handmade in the original Birmingham factory using century-old tools. The referee whistle includes a keychain loop, so you can attach it to your keys or a lanyard. LOUD AND CLEAR SOUND - The coach whistle is made of solid brass with a natural cork pea that delivers a loud, piercing tone with sound decibels reaching 114dB. This loud whistle can easily be heard even over long distances, ideal for emergency situations.