Tojiro Pro Edging Japanese Whetstone #1000 Tojiro Pro Edging Japanese Whetstone #1000 is manufactured from fine, perfectly graded, sintered ceramic and are strongly recommended for the maintenance of Tojiro blades. Features Professional quality synthetic water stones. Tojiro, one of Japan’s top knife makers, still follows ancient techniques handed down by generations of master smiths to handcraft knives for the 21st century. All Tojiro knives are painstakingly made at their Niigata, Japan factory. Tojiro knives are the #1 selling brand for professional in Japan.