Made of , the whistle is solid and . With loud sound, it is suitable for outdoor sports, like hiking, camping, climbing, etc. It is also for daily exercise, like pet training, football, basketball, soccer, hockey or others. With mini and portable size, hanging keychain ring decor, it is easy and convenient to take it anywhere you want. Features -Material: Brass -The sound is loud and crisp, you can quickly catch the crowds' attention anytime you want. -Each whistle comes with a hole, you can put easily around your neck, or on a wall mount, helps you free your hand. -Using brass material, it is , and sturdy to use, than the plastic whistles. -Also, this whistle is also a nice pendant, thus you can on your keychain or car. -These whistles are great for referees, training, teachers, survival, emergency, school, gym, etc, also suitable for people of any age. Package list: 1 x Brass Whistle