I've used rollerblocks and did not like the sound. No one wanted to buy them from me so I guess they are not a popular item.
I like ceramic foot sanding stones. Only a couple of bucks and these provided the best sound unless you want to "tweak" the sound with more bass, more treble, etc.
I like ceramic foot sanding stones. Only a couple of bucks and these provided the best sound unless you want to "tweak" the sound with more bass, more treble, etc.