The Morihei Whetstone, Hishiboshi (Hi) Series is a step up from the Shapton Whetstones in my opinion. These are high performance synthetic stones have larger dimensions than the Shapton series and are longer lasting. Regarded as professional stones made to mimic natural stones.
About Morihei: Morihei is a knife and whetstone supplier located in Asakusabashi, Tokyo. They have been a part of the industry for over 100 years, including the predecessor of Morihei “Oguro-Morihei-Shouten“. At one point in time, more than 20 groups of blacksmiths and sharpeners were working exclusively under Morihei. They are one of the only companies in Japan with a long-standing history of relationships with blacksmiths and whetstone and natural stone makers that still exists today.