Love your Kaweco Fountain Pen, but feel like trying something new? These nibs will change the line width of your writing, creating finer or broader strokes. The Fine, Medium, Broad and Double Broad are all tipped nibs, meaning they'll feel super smooth on your page. Each of the italic calligraphy nibs are untipped to create that italic, thick/thin stroke depending on the angle of the pen. These nibs will fit the Kaweco Sport Brass, Aluminium, and Liliput pens. If buying for a Supra, please make sure to select the "Supra" nibs. Please note these nibs **are not** for the standard Kaweco Sport or Perkeo pens.