These man-made water stones are created by compressing abrasive powder, such as clay or ceramic, and binding these ingredients together with an adhesive. Man-made stones are far more affordable than natural stones comprised of ash. A worthwhile comparison is that of natural vs. industrial diamonds. For the purposes of rodmaking, the synthetic water stones are more than sufficient and they beat the dickens out of oil stones for their ability to create sharper, longer lasting, honed edges. Thoroughly soak in water before use and keep the stones wet during use.
Made in Japan