FJTANG 6 Pcs Bright Color Large Size Aluminum Alloy Waterproof Camping Survival Emergency Whistle Outdoor Exploration Loud Whistle They are made from superior 60 aerial aluminum alloy material by digital machine through exquisitly grinding cutting process, along with keychain for attachment to a lanyard or keys Easy blow gives a clear instant response. Very loud whistle can be heard for far distance.Total length is 6.5 cm. Large size with 0.46 inch diameter, comfortable to grip in hand Looks like little item,but potentially important life-saver, they are perfect for hiking, mountain climbing, cross-country, travelling, sporting events, camping, boating and other outdoor sport activities. You can attatch it to your backpack, belt, or hanging to your neck.Fashion and practical. Once encounter danger, accident, electricity in short supply, signal shielding, or losing touch with companion, whistle could help you a lot With anodizing eye-attracted bright colors can be easily paired with anything, colors will not fade with time. simple and easy design lets you more outstanding among friends. Beautiful colors give you good mood every day Package included: 7 Pcs outdoor exploration loud whistle