Years of developing bicycle mirrors has led to the Third Eye Eyeglass Mirror, your small, easy, and lightweight little friend that will help you to stay safe while riding in traffic. It's shatter-resistant aluminized glass mirror lets you see what’s coming up behind you on the road or bike path. Attaches to normal glasses as well are most sunglasses. This Made in the USA product installs in seconds and is vibration-free. Find your perfect view with the fully adjustable arm pivoting on a unique ball-and-socket design. No more right side neck pain from glancing over your shoulder! No more swerving when you look back! Let the Third Eye Eyeglass Mirror do the work!