Outdoor Portable And Simple Aluminum Alloy Rescuing Whistle

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.