【High-quality material】The black helmet combination lock is made of high-quality metal and thick PVC, strong and durable, high strength, good toughness, fine workmanship, rust-proof and wear-resistant, not easy to break and deform, anti-theft. The PVC coating throughout the body can effectively prevent scratches and ensure the safety of your bike. 【4-digit password helmet lock】The factory default password for the small bike lock is 0000, tens of thousands of password combinations can be set, with a high safety factor. You can easily follow the steps in the user manual to reset the code you want, it opens and locks very quickly, increasing the security level and reducing the risk of theft. 【Retractable Design】The bicycle combination lock can reach 150 cm in length when stretched, so you can easily attach your helmet to your bicycle or motorcycle and wrap it with ease. Enough to lock all parts of the bicycle, such as the front and rear wheels, handlebars and racks, a second bike or anywhere. 【Portable and Convenient】The motorcycle helmet lock is small and lightweight, you can carry it with you and put it in your backpack to save space for daily travel. With the spiral design, it can be rolled up automatically, more convenient to install and use. No need to carry keys when you go out, no more worry about forgetting or losing your keys, bringing you more convenience. 【Multifunctional Helmet Lock】Helmet locks can lock bicycles, strollers, skis, motorcycles or scooters in addition to locking doors, fences, helmets, sports equipment and toolboxes. Enough to meet your daily needs.