Nibs

Factory #5 and #6:

​XF = Extra-FIne .4mm
F = Fine .5mm
M = Medium .6mm
B = Broad .8mm
1.1 = Cursive Calligraphy
1.4 Cursive Calligraphy (#5 only)
1.5 = Cursive Calligraphy (#6 only)
1.9 C= Christoph Nib (#6 only)

Masuyama/Nagahara Customized 

​N = Needlepoint .25mm
FI = Fine Italic .55mm
MI = Medium Italic .7mm
MS = Medium Stub .7mm
BI = Broad Italic .9mm
BS = Broad Stub .9mm

Franklin-Christoph S.I.G Custom #5 and #6:

SIG XF = .45mm
SIG F = .55mm
SIG M = .7mm

​SIG B = .9mm