Check the listing for details. Unique Working Brass Whistle Keychain w/ Screw Lock Carabiner Keys Easy On/Off. Color: Brass, Condition: New with tags. Listed at 6.79 USD. Overall Length: 4.5 InchesChain Length: 1.25 inchCarabineer Length: 1.5 InchesMaterial: 100% Brass and GlassHandmade100% Brass ConstructionWhistles have been around for centuries and have many different uses. They come in all different shapes, sizes, and colors. Night watchmen in Ancient China would blow into the tops of acorns to alert the towns to invading Mongolians, in the third century. In ancient Egypt two blades of the papyrus plant along the Nile River were held together in between the palms. By blowing into the palms the papyrus leaves would make a loud vibrant sound. This keychain is 100% brass that comes on a swivel brass chain with a screw lock carabineer. Today whistles are still widely used especially in sports. This keychain would be a great gift for the Coach, Referee, or Police Officer in your life.