In this video, I review the 320 grit Nubatama waterstone from the Ume series of stones. The knife I use to demonstrate this stone is an old Gerber cleaver from my college days in the 70's that I haven't used in years. It is (I believe) a 440C stainless steel blade. It has an uneven bevel and can only slice cut a piece of paper with some difficulty. The stone is porous but saturates in a few minutes. It generates a modest amount of mud, with the mud helping to cut more aggressively. There is minimal dishing of the stone. It very quickly helps me establish a consistent edge (flat bevel), giving me an edge that easily slice cuts paper and can begin to push cut. This stone would be an excellent coarse stone for a set of stones if you don't require extreme reshaping, but want to get an edge useful for basic cutting.