Pen comes with a cartridge, you could buy 39mm lengthen and 2.6mm inner diameter cartridge or use syring to filler the empty cartridge, thanks  https://www.ebay.com.hk/itm/233590765485

Pen lengthen: 85mm

EF/F are straight nib

Fude nib is bent nib

0.7/1.1/1.5/1.9/2.5/2.9mm is stub nib

Weight:26g

Package:

1pcs pen