Shapton #5000 polishing stone Hanokuromaku.
A hard stone that requires  no soaking, it is ready to use just by wetting the surface to lubricate it. It reduces much more slowly but nevertheless requires training with each use, once deformed, it will be all the more difficult to train. 
Shiny finish, strong abrasion for fine grain.
To be used after polishing on stone #2000 or #3000 preferably.