Black ISO Dampeners 6339This is a pair of black ISO dampeners. These are designed to be used with any of the Kuryakyn ISO grips. They come with two sets of screws so they can be used with or without throttle bosses. These help to reduce vibration in the grips and look great, too! NOTE: If you are using these dampeners with the ISO grips for heated grips you will also need a pair of knurled accent rings sold separately on this site. 6339, 49 5586 Item: K6339 Kuryakyn