Description These whistles are made of premium stainless steel material which are strong and durable. no easy deformation, a long period to use. they are also keyrings which you can tie it on your backpack or bags etc. It is also a funny toy for kids. Features -Color: Silver -Material: Stainless Steel -Size: 4.50X2.00X1.80cm/1.77X0.79X0.71in -These whistles are great for referees, training, teachers, emergency, school, gym, etc. -Made with good quality stainless steel material, more durable than other whistles. -You can use it yourself or share it with your families, bringing them convenience. -The whistle will not crack or break easily, very good to carry in case of emergency. -Durable and compact, suitable for all weather use, can be your good accessory in a match. These whistles are great for referees, training, teachers, emergency, school, gym, etc. Made with good quality stainless steel material, more durable than other whistles. You can use it yourself or share it with your families, bringing them convenience. The whistle will not crack or break easily, very good to carry in case of emergency. Durable and compact, suitable for all weather use, can be your good accessory in a match.