The Safe Zone Bicycle Helmet Mirror is simply the finest helmet-mounted bicycle mirror made. We are certain of this because of thousands of our customers who have told us this in no uncertain terms. Cyclists who are safety-oriented quickly come to realize that our product is superior in functionality and durability to all competing helmet mirrors. The 2 1/4" mirror yields a huge field of view, much larger than any other helmet mirror. The mirror's size makes it easy to view everything approaching from the rear while the sturdy mounting is unparalleled - with no weak adhesives or fragile parts! Additionally, the linked stalk is easy to adjust , maintains functionality and is guaranteed not to loosen! Simply attach to helmet with included zip-ties, bend it into a position that offers best visibility, and watch your awareness of the road behind you go beyond anything you previously knew was possible. We personally service the 5-Year No-Fault Warranty, so you don't have to worry about your bicycle rear-view needs for at least 5 years from purchase. Try it out and we're sure you'll agree that the Safe Zone is the finest bicycle helmet mirror made. Product ships with a protective plastic film over mirror which must be removed before first use.