The beads are tiny ceramic balls (one brand has a static charge so the stay in place to some degree when you stop). These beads find their location by centrifugal force as your tire turns and keep it in constant balance, even as your tire wears. They are dry, not in a gel or liquid like fix-a-flat. Another benefit is no lead weight on the wheel. If you just google dyna-beads you will find a lot of info. I think they recommend about two ounces per tire in a regular MC tire, probably more for a darkside tire.
2004 Vulcan Classic 1500 - carbed
Grips, Freeway pegs, engine guard
Floorboards, Nomad rear seat,
Custom made luggage rack, Windshield & Lowers
Saddlebags, Passenger floorboards,