DescriptionThese 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: As Shown-Material: Stainless Steel and Nylon -Size: About 4.50X2.00X1.70cm/1.77X0.79X0.67in - 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.