Features: Good Quality Materials: This double tube whistle is made from high-quality aluminum alloy, designed for long-term use. Loud Whistle: Produces a high-frequency, loud sound with long transmission distance, ideal for various emergency situations. Easy to Use and Carry: Compact and lightweight aluminum alloy whistle that can be attached to a keyring for convenient portability. Multi-purpose: Aluminum alloy safety whistle suitable for a variety of outdoor activities such as camping, hiking, and hunting. Wide Application: Ideal for adventurers, sports enthusiasts, and trainers, this whistle serves as a reliable tool for signaling and communication. Specifications: Material: Aluminum Alloy Package Weight: Approximately 30g Color Options: 7 colors available as shown in the picture. Size: Approximately 55x10mm / 2.16x0.39in Note: Please allow 1-3mm error due to manual measurement. Please ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the picture may not reflect the actual color of the item. Thank you! Package includes: 2 Pieces Lifesaving Whistle