Descriptions: The is a bamboo section style brass whistle, you can use it when you are in a extreme environment or in a state of emergency that you can use less effort to blow the whistle to call for help. The whistle is made from brass and exquisite workmanship. Through the polishing and pickling process, which can effectively protect the post, and not easy to scratch and oxidation. The special of brass is during its oxidation process, different colors will have different beauty. After oxidation, you can use sandpaper or toothpaste to wipe, and it can return to the brass color of its initial state. This survival signal whistle, great for outdoor sporting events, camping, hiking, boating etc. Features: 1. With great airflow design, it can easy to whistle and make a loud, clear sound. 2. Lightweight and convenient to carry. 3. The overall quality of brass to build, exquisite workmanship. 4. Through the polishing and pickling process, which can effectively protect the post, and not easy to scratch and oxidation. 5. Apply to outdoor survival, life-saving and collect. Specifications: Material: Brass Color: as shown in the pictures Length: approx. 54mm Diameter: approx. 10mm Weight: approx. 21g Packing: Thick PP bag Package Included: 1 x brass whistle Note: 1. Please allow 1-3mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please in kind prevail.