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It is hard to define the grit of a natural stone. Most people seem to rate it at 8 to 10k I think. With slurry it can cut much faster and may be effectively like a 4k. In either case it is generally...

James, I happen to like the Naniwa line best. Some like the coticule. The 30k is a very expensive stone and for advanced practitioners IMO. The 1k, 5k, 8k and 12k are the naniwas I would recommend....