As part of a series of demonstrations of the Nubatama Synthetic Japanese Waterstones, this stone is a 120 grit stone of the Bamboo series. It is the second most coarse stone, with the 60 grit being even coarser. This stone is very useful for establishing an initial edge and doing all but the most serious of repairs. Porous, slow wearing for a low grit stone. In this video, I take a knife that has no cutting ability whatsoever, demonstrated by the inability to cut my hand, rolled up paper towels or do anything other than squash a tomato when attempting to cut it. In just a few strokes, I quickly generate a burr, remove the burr, turn it over and generate a small burr on the opposite side and remove it. I then repeat the test and get excellent cutting performance easily slicing the rolled up paper and effortlessly slicing a tomato. I did not test it cutting my hand for obvious reasons :)
This is a fast stone, excellent for quickly establishing a working coarse but sharp edge in no time at all.