It takes flexible steel wire rope as the core, the jacket is wear-resistant PVC, lightweight but shear-resistant, can be wound around the wheel hub, frame and fixed pile, and the locks are mostly anti-skid alloys, which can be opened with a key or password.It is compact in size and can be stored in a seat bucket or backpack when riding. It is locked when parking, and anti-theft is completed in 30 seconds. It is a practical choice for urban commuting and short-distance travel.