Come and see our amazing products. The Emergency Survival Whistles are made of Aluminum Alloy Material, strong and durable; double tubes design is perfect to be heard at long distance.With key chains and hanging ropes, so it can be tied to backpack, belt or hanging around the neck.Loud safety whistle is nice for camping, hiking, hunting, fishing, boating any kind of outdoor and sports activities, even dog training in all environment and all weather. Custom logo is welcome. Pls confirm with us about the packing info, stock color and exact production time before placing your order.