Come and see our amazing products. Aluminum alloy material is strong and durable. With a unique double-tube design, our emergency whistle is super loud. A loud safety whistle for any type of outdoor activities such as camping, hiking, hunting, fishing, boating, and can also be used for dog training. 2 1/5" L x 9/16" W. Pls confirm with us about the packing info, stock color and exact production time before placing your order.