Made of High Quality Strong & Sturdy Brass, Durable, Anti Rust Excellent Airflow Design, Easy to Whistle & Make an Extra-loud, Clear Transparent & Melodious Sound Signal with a Keyring Chain Ring on the Top, Small Gear Attachment to Your Personal Keychains, Wrist, Vests, or Bag Pack, & Take It Wherever You Go Ideal for Outdoor Activities, Camping, Kayaking, Hiking, Tactical Training, Basketball, Marine Coaching, Classroom, Etc., Perfect for Childrens, Animal Trainers, Boatswain, Referee, Officials, School Teacher, Basketball, Football, Football, Security Guards, Life Guards, Lifesaver, Scout, Hiker, Boat Safety Warner, Noise Maker, Etc Can Also be Used for Communication with Companion in Remote Areas, Calling for Help in Emergency. 62x11.5mm.. Minimum Quantity: 100