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[QUOTE=ernestrome;89071]The pro stones are full thickness, ie what you see is all sharpening material, whereas the m5 stones are only a quarter inch of sharpening material glued to a ceramic...

do you remember how much you paid for them? It sounds like you have the "pro" series.

thanks
Andrew

I have found two models of Shapton hones... one of which is much more expensive than the other (the "professional series"). Is there really a big difference between the two? Both families of hones...