Cjeremy2000 Berserk Mini Colorful Keychain Style Trumpet Son Bulk Aluminum Outdoor Survival Whistle Specifications: Length 6.8cm (including ring) whistle whistle length 0.9cm diameter 4.7cm Color: black silver red blue gold, purple, green Material: Aluminum Alloy antioxidant treatment does not wear Summary: high quality aluminum alloy material, the sound loud, surface anodic oxidation technology, do not fade, prolonged use, is your outdoor