There are three reasons Shapton Glass Stones work so well. First, Shapton Stones are made from the most carefully graded ceramic particles on the market.
Second, Shapton stones have a very high density of the particles.
Third, the key aspect of Shapton Glass Stones is the high degree of uniformity in the distribution of the particles. The even particle distribution results in fast honing at every grit level.
This combination of uniform particle size and the dense, even distribution of those particles makes Shapton one of the fastest sharpening abrasives available.
Shapton is so confident in their grading system that they are the only stones marked with the abrasive size down to 2 decimal places. You won't be disappointed.