Darller 7 Pack / 10 Pack Emergency Aluminum Whistle Black Survival Whistles with Key Chain for Camping Hiking Hunting Outdoors Sports DURABLE MATERIAL --- The aluminum whistles are always made out of a strong aluminium alloy, and the painted surface goes through an oxidation process to prevent it from chipping and rubbing off. PRODUCT SIZE --- The size of camping whistle is 4.7cm * 0.9cm.it is made of durable aluminum body comes, light weight. WIDELY APPLICATION --- Loud sound can be heard even far away. The whistle is fit for camping, hiking, hunting, boating and can be a gift for little children. PACKAGE INCLUDES --- Package includes 7 colorful whistle with corresponding 7 key chain ring available to hang the survival whistles, convenient for carrying and prevent from losing. RISK FREE --- Quality guarantee and 5-star customer service. If you are not completely satisfied with your safety whistle simply let us know and we will do our best to solve your problem.