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Made of aluminum alloy and metal keychain, durable and non-toxic, not easy to break, fade or corrode,Loud whistles:aluminum alloy outdoor survival whistle can make big and bright sound,which can be heard from a long distance,very useful for various emergency situations;During outdoor travel,you can confirm the direction for you, avoid getting lost, find companions, etc.Dimension:these loud whistles measure approx. 4.7 cm/ 1.85 inches in length,diameter of the these whistles is approx. 0.9 cm/ 0.35 inches, suitable size for your use and storage,each emergency whistle is equipped with a round key chain ring,compact and strong,elegant personality,can be hung on the key ring as an ornament,portable design,easy to carry around
