If you have used a Schmidt refill in any brand of pen, again it is best to compare the old refill to those currently offered. We carry the Schmidt 5888 rollerball refill (our item R4606) to replace Schmidt 888. They fit and write the same.
We also offer a Schmidt mini rollerball refill which specifically fits the Delta Dolcevita rollerball and Montegrappa Micra mini rollerball.
It you find that a Parker-style ballpoint refill looks like your old refill, view all the different options shown in the Schmidt Ballpoint Refills window below.