This is a TSA-approved combination lock made of alloy steel and zinc. It features a 4-digit combination design that provides 10,000 unique possibilities, offering higher security than standard 3-digit locks. The white numerals on the black dials ensure easy reading of the code even in low-light conditions. The lock body is constructed from high-quality zinc alloy and durable, sturdy steel, capable of withstanding sawing, hammering, and prying attempts, while providing excellent scratch protection for daily use and travel. Equipped with a flexible cable and a portable size, it is suitable for backpacks, zippers, equipment cases, gun cases, and more, making it more versatile than ordinary shackles. The TSA-approved design allows TSA agents to unlock the luggage with their special key without causing any damage to the lock. Additionally, the agent must relock the luggage to remove their key, ensuring the safety of belongings during travel. The product is lightweight and equipped with an unlock button, making it convenient to carry and use. It is suitable for scenarios such as business trips, travel, hiking, fitness, and other activities, and can be used to protect various items. Color: Blue.