Product Material: aluminum alloy Size: 6.6 * 1 cm Keychain diameter: 2.9 cm Color: Gold+Silver Quantity: 4 pcs Package content: 4 pcs * Survival Whistle 1. Widespread This survival whistle is a great tool for outdoor activities such as camping, fishing, hiking, hunting, emergency life saving. Louder sound, double tubes can reach 120 decibels, can be heard for distant people. 2. Signal If you lose contact with your friends in the mountains and the phone has no signal, you can whistle and then stay where you are and wait, waiting for your friend to be rescued. 3. Strong and Durable Whistle metal, aluminum alloy make the whistle durable, safety confirmed. The pipe doesnt have a built-in pea so it wont mold and breed bacteria because of the pea.You can use it in any dust or dirty water environment 4. Small and light Can be easily carried on a keychain, convenient and practical, can be attached to your backpack, if necessary, belt, which can be attached to a lanyard or key. 5. Small gift Aluminum alloy whistle can be used as a creative gift for friends or children. Package includes, 4 x whistles with key rings