Vibranators slip inside the the bars. They grip like universal bar ends. The idea is they put weights towards the center of the bars and counter the vibrations. People have had great results with them and company claims lower heart rate from less vibes. That could be advantageous where fatigue is a factor... These were for Renthal bars but I don't see why they wouldn't fit other 7/8".
They're used but I never mounted them. I bought them around the time I was experimenting with bars. Went the fat bar way and that itself minimized vibrations.
I have the vibs. And stock bars. They are nice. Help out, but do not eliminate the vibrations. Next thing i have to do is get a set of renthals that match the stock set up. Aluminum and the vibs. Should work nicely