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The ones mentioned are natural stones.....

Sebastian (Sharpchef) did a Review on the GRF, check Post 131, sure its in german....

http://www.gut-rasiert.de/forum/index.php/topic,1528.120.html

There are more pictures where you can see how...

Those stones are very slow stones. You can try to prep they surface and they will kind of get more polished/smooth.

Its a finishing stone and should be used after a 8k or 10k. Very slow stones and...