This replacement nib is stainless steel. It is compatible with the following Kaweco fountain pens: Lilliput, AL Sport, AC Sport, Student, Allrounder, Special AL, and Dia2. See a full listing under Compatible Products.
The nib is not compatible with the following Kaweco fountain pens: Sport Exclusive Music Print, Classic Sport, Ice Sport, and Chess Print Sport.
To replace the nib on your compatible Kaweco fountain pen: grip the old nib top and feed with your fingertips and unscrew the entire nib component from the barrel. Grip the nib top and feed on the replacement nib component, and screw it into the pen until it is tight. Do not grip the nib by its sides.