Come and see our amazing products. These emergency whistles uses aluminum alloy and metal keychain, durable and non-toxic material, not easy to break, fade or corrode, double anodized treatment, Count on quality and safety. Not only suitable for emergency situation in camping, hiking, boating and other outdoor activities, but also referee, coach, lifeguard, pet dog training, school sports, competition, etc. Length 4. 7cm x Diameter 0. 9cm, it's mini and light but very loud that can be heard for far distance. Welcom ustomize it with the upscale look of a precision etched imprint. Pls confirm with us about the packing info, stock color and exact production time before placing your order