Material: High strength zinc alloy lock head, anti-theft, anti-rust and anti-corrosion. The surface of the bicycle lock is made of PVC material, prevents scratches and is much softer and more comfortable. Hard to crack: The 4-digit combination lock is specially designed for children with multiple possibilities. You can freely choose a 4-digit password, extremely safe. Lightweight to carry: The bicycle anti-theft lock is small in size, light in weight, soft and comfortable, easy to carry, the alloy lock head and lock body are not easy to break, you can put it in your bag, or hang it on your arm or on the upper bike rack. Multi-purpose: Four-digit code lock for mountain bike, but also for skateboard, gate, fence, ladder, bag, suitcase, stroller, etc. High security: With a convenient keyless lock, you don't have to worry about losing your keys or forgetting to bring them. Protect your bike or other property from theft and easily set up your own personalized number combination. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.