Doubletake Mirror - 3.5 Arm (Version 2)This is Doubletakes new and improved 3. 5" (90mm) arm, it is perfect for aggressive riders long enough to see, but small enough to tuck away and avoid brush on a 2 track Technical Specifications Length eye to eye: 3. 5" (90mm) Length overall: 4. 5" (115mm) Arm weight (Grams): 70 Grams Material: A380 Die Cast Aluminum Lifetime Warranty. Better hold, less effort. The whole system has been engineered together to keep the mirror from moving, except when