This inert material - non-resonant and non-magnetic - has a dense consistency and angular particle size to prevent pockets of air from forming. Mass loading and dampening a speaker stand is an important and simple initial upgrade to your audio setup. Each bag weighs 3.50 lbs.
Expensive, but worth itThis is pretty expensive filler, but easier to work with than others, don’t mess with sand or lead, and the likes. The performance stand can hold 3 bags per stand.