Aluminum Whistle Set - DefenderX 10pcs Emergency Hiking Camping Survival Coaching with Key Chain Design, 5 Color Colorful:Assorted colors available,Bule,Black,Red,Green,Gold,5 Color choose Material:Aluminum, Set of 10 Easy to Use:Survival emergency whistle with key ring,Portable and convenient Practical:Loud whistle can be heard for far distance,great for sporting events, camping & hiking,boating Looks like little item,but potentially important one, this Emergency Whistle & Keychain could be a life-saver.A Very Nice Aluminum Emergency Survival Whistle Key Chain Camping,fit outdoor activity, camping, fishing, hiking, traveling, keychain etc !