Efficient Velo Tools’ Safe Zone mirror is over 2 inches in diameter with a 4.5-inch arm. This results in an excellent rear view and hardly any of the neck craning. Equally impressive is how easy the Safe Zone attaches: simply zip tie the mounting bracket to a helmet rib and you’re good to go. The mirror’s cool ball-and-socket arm design lets you easily position the mirror for the best view. Shorten it by snapping it apart and together; remove the mirror from your helmet the same way. 100% Made in USA, all parts sourced within 30 miles of design and assembly facility Easily installed (and reinstalled on other helmets) with a simple, versatile zip tie mounting system Unusually robust construction (a hallmark of all things EVT) Adjustable, stable, stay-put huge 2.25" mirror Sleek, injection-molded components Incredible 5 year "no-fault" warranty