High quality brings you more security and you can enjoy more rides with your family or friends.The u lock is made of high quality alloy steel which is of high tenacity for strong cut resistance. The steel cable is covered by a high-quality PVC material coating to keep your bike lock from scratching or rusting. The 2-in-1 bike lock will bring you more security and flexibility to lock your bike. We are fully committed to customer satisfaction and we only use the highest quality materials to make our bike locks. The whole design of the bike u lock can prevent it from picking, knocking and bumping.Sturdy & Comfortable!Made of high quality alloy steel, the 13.5mm/0.53inch shackle will resist cutting and leverage attacks.The bike lock is covered with environmentally-friendly silicone, which is comfortable and does not cause harmful substances to the human body. Besides, it helps to resist dust, dirt and scratching, thus to prolong the life of your bike u lock.Bring more safety for you!The lock cylinder of this U lock is made by C grade pure copper blade, it will make any thief think twice before trying to steal your biycycle, thus increase safety factors of your bike or accessories. With this bike u lock, your bike will be effectively protected.Notice1. Please keep the lock cylinder clean and dry during daily use.2. If the lock is difficult to open because of sediment or long time of not using, some pencil lead powder can be added to solve this problem.3. Never leave your bike in remote places or leave your bike unattended for a long time.