Wide Applications: Suitable for referees, coaches, instructors, sports, rescue guards, teachers, self-defense, survival, emergencies, picking, bird or dog training , etc. Top quality: 100% food grade stainless steel, safe, durable and sturdy to use, much better than plastic. Loud and powerful: the sound is loud and crisp, you can quickly attract attention at any time . Free Your Hands: Each whistle comes with a black lanyard, you can easily hang it around your neck or on a wall mount, helping you free your hands. Package include: The package includes 5 stainless steel whistles and 5 yellow lanyards, much better for everyone to use at any time, and you can send different men you like.