This is a natural whetstone from Aiwadani. The surface was prepared by myself from the raw stone. Please refrain from purchasing if you are looking for perfection, as this is a DIY level job. This is perfect for those who want to try a natural whetstone but think the authentic ones are too expensive. It's a bit hard, and it feels similar to Nakayama whetstones. It can be used for both small blades and cutting edges. The stone gives the impression of brightening and clouding. Please check the photos carefully as the edge of the whetstone surface is angled. There are layer cracks and chips, so the surfaces other than the whetstone surface have been treated with cashew lacquer. As this is a natural product, there may be streaks or dragging that were not apparent during my test sharpening. Please consider this as well. Length: Max. 183mm Width: Max. 90mm Height: Max. 23mm