Standard  is suitable for use with any standard nib, including the Speedball A-, B- or C-Series or the #22B, #56, #99, #100, #101, #103, #512 and #513EF pointed pen Nibs.

Crow Quill fits nibs #102, #107 and #108

104 fits nibs #100, #103 and #104.

 Oblique is for copperplate/Spencerian script with the #101 and #103 nibs