Fasst - Handlebar Non-Threaded Anti-Vibration InsertsQUICK INSTALLATION, NOTICEABLE DIFFERENCE. These Anti Vibration Bar Inserts have been a staple since introduced in 1999. A discreet, but incredibly effective component to any serious racer or casual rider, our inserts do a great job absorbing the vibration transferred from the bars to your hand yielding less fatigue and arm pump. Riders have been installing in them in anything with handlebars from quads to superbikes with great results. Constructed