I like these "abrasive" blocks they dont seem to do any damage to your tracks and they really do clean.
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5 of 5 people found the following review helpful:
Deceptive
June 27, 2011
Reviewer:
johan c wildhagen
from washington, DC United States
I thought it was a stone, even after I used out a couple times but it is a chunk of rubber. Just takes a bit to bend it. It didn't wear like the rest and didn't leave allot of particles behind to get stuck in the gears and wheels. Ill probably get another like It when this one wears out.
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8 of 8 people found the following review helpful:
Different than usual
February 17, 2010
Reviewer:
Patricia Zottoli
from Gainesville, GA United States
It's not near as gritty as most of the other brands and when being used, it has a lot less resistance against the rail. In other words, it seems to slide across the rail rather than work against the rail like the other brands do. It has about the same feel as a sheet of 2000 grit sandpaper. I mean, it feels very smooth. One positive thing though, it does'nt seem to ware down anywhere near as fast as the others do, and it's longer. It DOES work, but just not near as fast as some of the other brands do.
Not really that abrasive but good 
Deceptive 
Different than usual