describe: color as shown Material: aluminum alloy Weight: 6g Size: 4.6*0.4cm/1.81*0.15inch 1. Made of high-quality aluminum alloy material: it is a professional outdoor survival whistle, with large diameter, louder high frequency and long transmission distance. 2. Fashionable and practical, great use at critical moments, each whistle is equipped with a ring, which can be hung on keys or bags for convenient use. 3. The surface is smooth and eye-catching, the color is eye-catching, the aluminum alloy material, the surface adopts anodizing technology, the color does not fade, and the service life is longer. 4. Wide range of use: It can be used as a survival tool when there is danger in the outdoors, these emergency survival whistle can make a loud and bright sound, which can be heard from far away, very useful for various emergency situations, can make other people quickly Confirm your location and quickly it is a good tool for camping, hiking, hunting, mountaineering, boating and other outdoor sports, also suitable for referees, lifeguards, dog training, etc. notes: 1. As we all know, different computers display different colors, and the actual color may be slightly different from the picture below. 2. If you find it difficult to choose the size, you can contact me at any time, we will give you some suggestions, but only for your reference. 3. We can accept orders of mixed items, colors and sizes. This product includes: 1 pc whistle