DELICATE & PORTABLE: This lock is so delicate that it wont occupy too much space, so you can take it in your bike bag, pocket or backpack. ZINC ALLOY LOCK: The main section of lock is made of zinc alloy, which makes it lightweight, more sturdy and more durable. THICKENED PVC COATING: Made of high quality PVC material, the steel cable has a thickened coating, its diameter arrive at 4.6cm that is has a strong cut-resistance. In addition, a coating can protect your bikes painting. 4-DIGITS CODES: The helmet lock is equipped with a 4-digit combination locking mechanisms which provide a sea of possibilities. You will no longer worry about lose the key or forget to carry it. MULTI FUNCTION: With a long elastic high-strength steel cable (150cm), our lock can be widely used to protect your bicycle, helmet, trunk, backpack, door or other items from theft.