ITEM NAME:Stainless Steel Double Pipe High Decibel Emergency Survival Whistle Ke VFQ Descriptio n Details: Name: Metal stainless steel double tube high frequency whistle outdoor survival whistle fire whistle referee sports multi-function whistle Size: 57*18mm, thickness 9mm Color: silver, gray black random.Function: high frequency double pipe whistle is a good helper for outdoor products. Stainless steel double tube high frequency whistle. Material: Stainless steel. We want to make sure you are happy with our item.