Kuryakyn Contour ISO Throttle Boss With the addition of a throttle boss can make the difference between a quick trip or a cross country adventure. Features great style with a larger surface area and pad, to provide even more comfort to easing tired hands and forearms. They are easy to install and can be adjusted to suit your needs. Features: Updated styling with a larger surface area and pad Provides even more comfort than the original design Eases hand and forearm fatigue Right and left-hand side available