This portable bike lock is made of zinc alloy and PVC, featuring a 4-digit combination lock for secure and convenient use. It has a soft PVC plastic coating for comfort and a high-strength zinc alloy lock head for durability. The lock is small and lightweight, making it easy to carry. It comes with a 4-digit password, which can be set to one of 10,000 possible combinations for added security. The initial password is 0000. The package includes one bicycle lock.