Home FSA World Multimedia NS Vas stem, the first of its kind! 30 Jul 2021 NS Vas stem, the first of its kind! FSA's new Vibration Absorbing Stem for AGX and MTB applications is the first of its kind. Featuring significant vibration damping via 360 degree handlebar isolation. In turn, reducing forces and impacts to the rider's hands and arms. The result being less arm pump and hand fatigue for a better ride and shorter recovery.