A soft, man-made chalk stone. Rub on the ceramic toishi (water stones) along with water to create a lubricating paste that improves sharpening action and gives a high polish to the blade.
*Currently out of stock. More should arrive in September/October, 2017. If you order one of these stones, it will be placed on backorder and shipped as soon as possible. You will not be charged until we ship it and there is no additional shipping charged on backorders shipped within the U.S. Thank you for your patience.