The 4 digit locking mechanism is made from weather resistant zinc alloy and to protect your bike, the aluminium carabiner is covered with a protective plastic coating.  Since the HelmetLok is not permanently mounted to your frame, you are free to attach your helmet to any suitable place on your bike. Small and compact enough to fit in your pocket or on your belt loop, why be weighed down carrying your helmet around! Use the simple-to-operate HELMETLOK to secure your helmet to any part of your bike and enjoy the security and freedom of HelmetLok.