The Kaweco steel and gold plated 060 nib unit is threaded and comes in 5 sizes from EF to BB. Calligraphy 060 nibs come in 4 sizes from 1.1mm - 2.3mm. A twin calligraphy nib is also available. They can all be used with Kaweco Liliput, AL Sport, AC Sport, AL Special, Brass Sport, Student, Allrounder, Art Sport, Luxe Sport, Dia and Elegance fountain pens.
The Kaweco threaded 250 Steel Nib Unit is available in 5 nib sizes, and is suitable for Kaweco Elite and Kaweco Supra fountain pens.