The Profile Design Cobra S 1-1/8" stem for mountain is a strong, lightweight and stand-out piece. It features 3-D forged 7075-T6 aluminum wrapped in a gloss carbon finish, weighing in at 130 grams and offering what Profile Design calls "excellent vibration dampening". The Cobra S is available in both 84 and 96 degree rises and lengths ranging from 80mm - 120mm. The 4-bolt clamp mounts to 31.8mm bars. The Cobra S is available as a black stem with white graphics as well as a black-graphics-on-white style. To install correctly, it's best to have a toque wrench and allen bit, tightening each bolt back and forth in a cross pattern. Check manufacturer packaging for torque specs.