Our XS and ESCALA fountain pens are designed to allow changing the nibs. We offer additional nibs in various sizes (line thickness) and materials. All these nibs fit any XS or ESCALA fountain pen. It is very easy to swap them, you just need to unscrew the entire nib system and screw in a different one.
Black Stainless Steel: F, M, B
Polished Stainless Steel: F, M, B