Sword grade Chu Naguras thy are super nice for swords for razors and for knives !! Bit harder then Asano Naguras, something around 6-8k, slurry brakes even faster on those then on Awasedos so they can be quite nice finishers too, if you can get slurry out of them ;D They are very beautiful stones with small different color dots, Kan patterns, yellow white stripes. Something very special i think for stone collection !! They are without any inclusions or lines and are much more affordable then Asano Naguras.