Sai is Global"s top of the line series. It was designed by Komin Yamada, who designed the classic Global line of knives. Sai knives are made of harder steel to maintain it"s sharp edge longer. It is sharpened to a narrower angle to create a sharper blade. The handle is contoured to accommodate your fingers more comfortably. The hammered blade while beautiful also serves to keep food from sticking to the blade. Made in Japan and backed by a lifetime warranty.