Natural whetstone, Nisshozan, Shirasuita, Akarenge, a small piece. The surface was prepared by myself from the raw stone. As it's a DIY level job by an amateur, please refrain from purchasing if you are looking for perfection. There is a possibility of layer cracking and chipping, so areas other than the whetting surface are coated with cashew lacquer. It produces a lot of mud and has high abrasive power, making it a Suita whetstone. Ideal for removing scratches from medium grit stones. It's a very easy-to-use whetstone, so it's also recommended for beginners. As it is a natural product, there may be streaks or areas that become apparent during use that were not noticeable during my test sharpening. Please consider this when making your purchase. Length: Max 53mm Width: Max 39mm Height: Max 12mm