BESTER waterstones, manufactured by Imanishi in Kyoto, Japan have almost become the standard with Japanese professional woodworkers. They feature a moderately strong bond that allows abrasive particles to release quickly, maintaining a fast cutting rate, yet resist wear better. These stones behave similarly to a natural stone, the feedback tells you how fast it is cutting. Tests have shown they abrade O1, A2 and M2 steels at a rapid rate and remain flat just as long as slower cutting stones with stronger bonds.
This Imanishi 220 grit is used for removing chips