Blowrate: Most effort Blowsound: High Loudness Blowtone: Deep Size- 2.25" L X 1" H ACME TUNDERER NICKEL PLATED WHISTLE (LARGE) Model 58.5 Made in England since 1884, Acme's Thunderer Whistles are designed to offer total reliability, control and power. Made from brass and then nickel-plated with pea (ball). Big deep sound, far carrying, more user friendly. Recommended for: Coaching, Police, Public Safety, referee Blowrate: Most effort Blowsound: High Loudness Blowtone: Deep Size- 2.25" L X 1" H