MasterLap Ultra, Ultra fine USA made ceramic polishing stone. Made with ultra fine micron graded 8000 grit ceramic. Highly compressed and high temperature fired to near diamond hardness. The most amazing substance we have found for polishing hard steels. The stone is precisely flattened and has two different engineered surface finishes, that quickly cut out scratches and polish the running surface much faster than even much coarser grit conventional or natural stones. The ultra hard flat stone leaves no detectable edge roll and allows for forming a very dense, perfectly square, super smooth edge. The exceptional glide has been proven with a host of world records to date. Comes with a custom made leather pouch. Available only through trusted dealers world wide.