The 3M Dual Lock-system is the perfect system for helmets with air holes. A small piece of self-adhesive Velcro is permanently stuck to your helmet. In mere seconds you can attach the light to your helmet. Whether you own a bicycle, ski or safety helmet, with the 3M Dual Lock holder you can attach the light to your helmet in no time at all. It will work perfectly on flat or slightly curved surfaces without air vents. Including cleaning cloth to clean the surface.