Kasumi Knives are produced by the Sumikama Cutlery factory in Seki Japan. Sumikama specializes in producing knives from the most advanced materials, with the most advanced manufacturing techniques and produces knives to a very high standard.
Sumikama was the first large Japanese knife manufacturer to use folded Damascus steel wrapped around a VG-10 core which has been replicated by many other manufacturers. Kasumi knives are typically very hard, more than 60 on the Rockwell scale. Sumikama specialises in using VG-10 stainless steel, a steel mix containing molybdenum, chromium, vanadium and cobalt. This highly sort after steel is one of the best stainless steels used in knife making. Sumikama knives are typically finished with a 15 degree bevelled edge.