Sounds like a video game or some such, but it’s actually a tough, injection molded polymer device that’s secured onto a stock throttle grip with a hook & loop strap giving the rider a relatively large, flat surface to rest the heel of the hand on, easing the normal hand and finger hold. This makes for far less effort to maintain a constant cruise speed, handy on those long days in the saddle. Simple and effective. Installs/removes without tools and packs away in no space when not needed.