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The thickness of the nib. For students
International standard pen tip writing thickness:

EF tip is about 0.38, and F tip is about 0.5.

Japanese pen tip writing thickness

EF tip is about 0.25, and F tip is about 0.3.

So if it meets the 0.5 neutral refill (thickness is about 0.35), it is the EF tip in Europe and America and the F tip in Japan.