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: 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.Packing list24 x Whistles