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How strange that these HC stones are going by 2k increments. Those who already have the 8k HC would want 16k not 10k!

These HC stones do seem to be very fine for their respective grits though. The...

yes, they are the grey stones.

What I meant was, with the Naniwas you can feel some friction. Not as much with the 12k, but definitely with the lower grits. Whereas the HC Glass stones are very hard and slippery, just gliding...

I think the Shapton HC 8k would make a huge upgrade for Chinese 12k users. It feels kind of similar (smooth and hard), finishes a bit finer, and cuts much, much faster. You can cut up your Chinese...

I have the Naniwa Superstones, Shapton Pro, Shapton Glass, and now the Shapton High Carbon Glass.

The HC Glass Stone feels hard and smooth like the Shapton Pro, but the scratch pattern is more...