Outdoor Portable And Simple Aluminum Alloy Rescuing Whistle $ 4.26 Product information: Material: aluminum alloy Size: Length 4.7cm, upper diameter: 0.9CM lower diameter: 0.9CM Color: royal blue, red, black, Rose red, purple, silver Features: it can be used for outdoor survival and training. There is a small ring on it, which can be hung with a key ring. Size: Packing list: Whistle*1 Product Image: