About Masamoto Swedish Steel The KS Series is Masamoto’s range of high-grade Sweden Stainless Steel Japanese traditional-style knife. Masamoto KS Series Wa Gyuto is completely hand sharpened, polished and finished by especially skilled and experienced craftsmen, which results in extra edge sharpness and a more refined level of finish.This line is highly recommended for those who enjoy knives with a traditional Japanese handle. About Masamoto Minosuke Matsuzawa, the founder of the Masamoto Sohonten Company started making knives in 1866. It was his dream that his family would come to be remembered as knife craftsmen throughout the generations. Now, five generations later, Matsuzawa’s vision has been realized and professionally crafted Masamoto knives have become widely regarded as the finest knives made for professional use. Purpose of Petty The petty is a convenient size for delicate work, cutting or peeling small vegetables, fruits and herbs.