The whistle is made of aluminum alloy and is available in red, yellow, blue, green and black. Portable and easy to use, with a key ring. Extremely loud, great item for any emergency, adventure, camping, mountaineering, hiking, sports, and so on. Customized logo can be laser engraved on it. Add your company’s name, logo and advertising information at trade shows, fairs, conferences and any other marketing opportunities to take the top spot in your next advertising campaign!