short description is not available 1 The out layer is made of PVC material which is harmless to the human body. It meets environmental standards and requirements. 2 The case of the bicycle lock is made of high-quality zinc alloy material. It does not crack at low temperature and does not deform at high temperature. It is a durable product. 3 This bicycle lock does not need a key to unlock, as long as use the password can be easily unlocked, simple operation and easy to use. 4 The bicycle lock has a four-digit password and is highly confidential. The probability of trying to unlock the lock is almost zero. There is no need to worry about the locks being broken and the bicycles stolen. 5 The cable locks are versatile and can be used not only on bicycles but also on any tool you want to be protected from, with a multi-purpose locking function.