Sigma Power Select II Ceramic Water Stones

Despite their remarkable cutting speed, Sigma stones are little known outside of Japan. Significantly faster than any other stones we have tested; the 1000x stone cut O1, A2, and M2 steel 10-15% faster than 1000x Bester/Imanishi stones, and between two and five times faster than 1000x water stones with less durable abrasive or stronger bonds.