Resettable and convenient -- ROCKBROS bike lock uses a combination mechanism instead of a key, eliminating the need to worry about losing or forgetting a key. Easy to use and simple to set your own password. Portable and lightweight -- Compact design fits easily into a cycling jersey pocket or bag. Weighs only 50 grams, making it easy to carry anywhere. Durable alloy lock body -- Constructed with a zinc alloy core and wrapped in PVC material to help prevent damage to your bike frame. Designed for wear resistance and long-lasting use. Elastic and flexible -- The cable can stretch up to 90 cm (35.4 inches), making it suitable for securing helmets to bicycles, motorcycles, or for locking luggage. Note: This lock is not designed to deter theft by tools. It is intended to slow down opportunistic theft. Contact the seller with any questions.