Man. This is the first set of aftermarket casters I ever bought and they kill anything I got on an amp. I got them for 20 bucks so they can't be more than 10-12 bucks to make. I wonder why more amp companies don't spare a couple bucks on the little things. http://www.americanmusical.com/Item--i-ERN-6102-LIST Seriously. Amp seems to glide on air and the casters are easy to get out. Rated at 80lbs per wheel. Call it a review if you want, but man these are awesome and easy to install Mods, I installed these on an amp but I am not sure it belongs here lol.