Product Name: Aluminum Alloy Double-Tube Whistle Model: AT7606 Material: Aluminum alloy Specifications: Length 55mm, Width 15mm, Thickness 8mm (with chain, total length 10.5CM) Peak volume: approximately 120dB Surface treatment: oxidation + sandblasting Color: silver Packaging: Individually packaged in OPP bags Packaged dimensions: 8*5*1CM Weight: 11 grams Features: 1. Lightweight and equipped with a keychain, making it easy to carry; 2. Larger diameter, louder whistle sound, outdoor rescue equipment; 3. Made of aluminum alloy, the surface is treated with anodized technology, which gives it a durable color that does not fade and extends its lifespan. Name: aluminum alloy double pipe whistle Model: AT7606 Material: aluminum alloy Specifications: length 55mm * width 15mm * thickness 8mm (plus chain full length 10.5CM) Peak volume: about 120dB Surface treatment: oxidation + sand blasting Color: Silver Packing: OPP bag independent packing After packing specification: 8*5*1CM Weight: 11 grams Characteristic: 1, light, and with a key button, easy to carry; 2, larger caliber, more whistle, outdoor help 3. Aluminum alloy material, the surface uses anodization technology to achieve color, does not fade, and has a longer service life