Description These whistles are made of premium material which are strong and durable. No easy deformation, a long period to use. They are also key rings which you can tie it on your backpack or bags etc. It is also a funny toy for kids. Features -Color: Random Color -Material: Plastic -Size: 4.50X2.30X1.50cm/1.77X0.90X0.59in -Professional and practical whistle for referee and school athletic meetings. -Classic appearance design, designed for instructor, trainers, and athletes well. -High-class material guarantee long service time, enjoy your own tempo and honor. -Suitable for racing, running, horse racing, swimming, exercising, competition, etc. -Can be the perfect gift for your friends who are the referees or instructors. Professional and practical whistle for referee and school athletic meetings. Classic appearance design, designed for instructor, trainers, and athletes well. High-class material guarantee long service time, enjoy your own tempo and honor. Suitable for racing, running, horse racing, swimming, exercising, competition, etc. Can be the perfect gift for your friends who are the referees or instructors.