Description These whistles are made of premium metal 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: Metal-Size:4.50X2.00X1.70cm/ 1.77X0.79X0.67inch-Made of premium metal material, durable and safety for long lasting use.-High frequency design make it more practical. outdoor use tool that you need.-Lightweight and equipped with key chain, easy to carry and can be your good helper.-An essential piece of safety equipment for you during outdoor activities.-Wonderful gift to your friends, family, camping lovers, travel lovers, etc. Packing list: 10 x Whistles