This sharp pebble whetstone dual grit is excellent and exactly what you need if you're looking for a very sharp blade.We also had a pretty good test bed for it -- since she had never sharpened a knife before, her knives were so dull that you couldn't injure yourself with one if you tried. They are literally unable to cut through a tomato's skin, even after vigorously sawing back and forth - you'd have to pierce it with the point first. We took one of these completely dull knives and worked it with this stone for probably 45 minutes and while it takes longer than that to get a knife from 100% dull to razor sharp, the difference was abundantly clear to everyone. It was once again an actual knife that could cut vegetables with ease. Overall great buy and I highly recommend.