[Material] High strength zinc alloy lock, anti-rust and anti-corrosion, durable. Seven-core protection, increase the safety factor. The lock body is surrounded by PVC, which is comfortable and soft to avoid scratching the frame and has a longer service life. Keyless lock: No key required, just press to lock, convenient and quick. The outer layer of the keys is wrapped with ABS plastic, which is sturdy and durable. Circular groove design, not easy to copy, increase safety. Each key has its own number, the probability of being unlocked by other identical keys is small, and it is more secure and anti-theft. Multi-bike lock mode -types: The bicycle lock has different locking modes, complete. You can lock the chainstays or the rear wheel. It can also be used as a disc brake. You can use two or more locks to lengthen the bike lock and lock multiple bikes together. Easy to carry: The single lock is 15cm long, 1.2.5cm in diameter, 1.2cm in ring diameter, 140g in weight, soft and comfortable,