Material: The keychains are made of environmentally friendly plastic and stainless steel, making them durable and portable. Each keychain features a paper tag on the inside. Dimensions: Luggage ID tags are approximately 5 cm/1.96 inches long and 2.2 cm/0.86 inches wide, with a keyring diameter of approximately 1.9 cm/0.7 inches. Easy to Use: Write down your desired information, such as your key number, on the paper card so you can clearly see the key you need. Function: Perfect for clearly and easily labeling keys, eliminating the need to search for the right one and preventing key mix-ups. Versatile: These can also be used as pet name tags, luggage tags, memory sticks, and more, making them essential for everyday life, home, and office use.