1. Main lock design: 4-digit password lock mechanism, keyless and convenient, freely set your favorite password number. The initial password is 0000.2. High quality: high strength, high toughness, strong cutting resistance. The flexible bike lock cable is highly resistant to cuts and the PVC coating helps prevent scratches. 3. Anti-theft: 4 digits with up to 9999 unique personal combinations, reducing the possibility of accidental theft while making it easier for you to remember your password time. 4. Portable: These mini anti-theft bicycle locks only weigh 105 grams. Weight-saving design, easy to carry. 5. Multipurpose: These bike locks are easy to operate and perfect for locking helmets, saddles, wheels, luggage, bicycles, skateboards, gates and fences.