Our 4 pack of whistles are made from a non-brittle plastic and can be heard from over a mile away. We are a U.S. Marine Corps Veteran owned company and stand behind our products 110%. Loud sounding whistles - This whistle has been d by professionals using state of the art equipment. The sound is up to 125 decibels. It's very easy to blow and can be used in all weather conductions. The material is compact plastic with high strength. It can be used in rainy or cold weather and will not rust or break. Capable of floating. Resistant to shocks. Easy to find: Bright colors. Highly visible. Easy to spot. Easy to clip/attach: This whistle is clip design. It can be clipped on your belt/backpacks/life vest and etc. You can also attach it to you using the lanyard. The whistle is light. Thanks to the clip design and included lanyard, it's convenient to bring with. No matter day or night, this safety whistle will definitely get you out of a lot of troubles. Recommend it to your relatives and friends. Get one for your children and wife!