DescriptionThese whistles are made of aluminium alloy and plastic material which are strong and durable. and the whistles are designed to give you the best chance for survival in a disaster or lift-threatening situation. they are also keyrings which you can tie it on your backpack or bags etc.Feature- Color: Golden and Silver - Material: Aluminium Alloy and Plastic - Size: About 5.5x1.5x0.8cm. - Aluminium alloy material,The surface is colored by anodic oxidation technology, they are durable. - High frequency design is practical. - Lightweight and equipped with key chain, easy to carry. - The whistle is an essential piece of safety equipment for you during outdoor activities. - Warm Tip: Dear buyer, due to lighting effect, monitor's brightness, manual measurement, etc., there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!