MasterLap Ultra fine 8000 grit Ceramic multi surface polishing stone. The ultra is the latest product from MasterLap and is quickly becoming the standard that all other hard polishing stones are measured. It is a Ceramic stone that is extremely dense, hard, and flat. These stones are made of high purity ultra-fine synthesized gem type compounds, precisely matched in grain size. This Ceramic stone is greatly advanced from conventional lightly vitrified or bonded abrasives stones claiming to be ceramic. The MasterLap Ultra Ceramic is of diamond like hardness, and efficiently super-polishes hardened high grade tool and stainless steels. It efficiently produces a stunningly polished, ultra flat, ultra smooth, surface with unmatched bevel accuracy and edge quality.