Virtually indestructible, glass filled Zytel used for mirror body selected for toughness, resistance to UV and temperature fluctuations, and lack of vibration. The ball joints will give way in a crash and thus protect you, your bike and lever perches, and the mirror.
Outstanding visibility - SAE spec convex lens increases field of view without sacrificing detail.
Easy to fold or remove - Having 2 ball joints allows the mirror to tuck away, no matter what bike you are riding. Being able to control the tension on the joints allows you to adjust the mirror at a light tension, and then lock it in. The entire mirror can be taken off without tools, leaving just an unobtrusive ball.
Position anywhere- No matter what your bike or position, you can set the mirror to give you the best view.