Description These are professional whistles for referee and school athletic meetings, suitable for racing, running, horse racing, swimming, etc. High-class material guarantee long service time, enjoy your own tempo and honor. Can be the perfect gift for your friends who are the referees or instructors. Features -Color: As Shown -Material: Stainless Steel and Nylon -Size: About 4.50X2.00X1.70cm/1.77X0.79X0.67in - Made of premium stainless steel material, durable and safety for long-lasting use. - High-frequency design make them more practical. Perfect outdoor tools that you need. - Lightweight and equipped with keychain and rope, easy to carry and can be your good helpers. - Essential piece of safety equipment for you during outdoor activities. - Wonderful gift to your friends, family, camping lovers, travel lovers, etc. Made of premium stainless steel material, durable and safety for long-lasting use. High-frequency design make them more practical. Perfect outdoor tools that you need. Lightweight and equipped with keychain and rope, easy to carry and can be your good helpers. Essential piece of safety equipment for you during outdoor activities. Wonderful gift to your friends, family, camping lovers, travel lovers, etc.