Material:Stainless steelRope color:YellowWhistle Color:SilverWhistle size: 4.6*1.8*2.1cmRope length: About 42cmTip: Use three sharp bursts to indicate a call for help. Use two bursts to answer a callQuantity:24pcsPackage Include:1pc WhistleNotice:1.Transition: 1cm=10mm=0.39inch.2.Please allow 1-2cm error due to manual measurement and make sure you do not mind before ordering.3.Please understand that colors may exist chromatic aberration as the different placement of pictures. Wide Range of Applications: Our referee metal whistle is a useful tool that can be used in various activities, competitions, and training sessions. It is for sports referees, coaches, teachers, and outdoor enthusiasts Clear and Loud Sound: The extra loud sports whistle's sound channel design allows for moderate air blowing and produces a clear and loud sound that can fully cover the noise from crowds and natural environments. It is easy to use and can quickly grab people's attention, making it a great tool for emergency situations Quality Material: Our referee whistle is made of high-quality stainless steel, iron, or copper, which is , rust-resistant, and long-lasting. It is sturdy and can withstand accidental drops or bumps without cracking or breaking. It can be easily carried around with you wherever you go Maintain Order and Control: Our loud sound whistle is widely used in maintaining order, directing traffic, controlling situations, rescuing and aiding, entertainment, sports, mining, ports, construction, and other fields. It is an essential tool for those who work in these industries or participate in outdoor activities Also clip the whistle to your belt or shoulder straps for quick and easy use in case of emergency. Item Weight 1.76 ounces Manufacturer DUXDJRRE Item model number DUXDJRRE Package Dimensions 0.39 x 0.39 x 0.39 inches