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bankiren
IR
Afaik they can be made from most round tubesets, they can be Reynolds, Columbus etc but you'll usually see kasei or ishiwata just because they're more readily available in Japan. I've not seen a full max NJS frame but forks are common.
I've had NJS frames in Ishiwata, kasei 4130, 8160 and Reynolds 853, my GF has one made from Columbus nemo, I have one with a minimax fork too.
In larger sizes they can be flexy, as can any type of frame, my Makino is quite flexy but my vivalo was stiff as hell. (Both around 58cm)