Here we shown refills for all OMAS pens, even discontinued models and models we do not carry.Most OMAS fountain pens are piston-fill only and utilize bottled ink. Take a look at the vast array of brands we carry. Some OMAS fountain pens use ink cartridges for refilling. These are standard international-sized 1-1/2" ink cartridges. If you have the ink converter that came with your OMAS cartridge fountain pen, you too can utilize economical bottled ink.All OMAS ballpoint pens refill with any Parker-style ballpoint refill. Check out the Ballpoint Refills for OMAS window below. The OMAS brand of refill is shown, as well as other Parker-style ballpoint refills in three ink types, three point sizes and ten different colors. Select from standard ballpoint ink, liquid ink or gel ink.OMAS rollerball pens can fit two different sizes of rollerball refill. Most take the shorter 4-5/16" refill. We recommend the OMAS brand, as some OMAS rollerballs do not fit the Schmidt option (P8126) that is shown. If you are not sure, you may want to try one of the Schmidt refills along with your OMAS refills, just to see if it works. A few OMAS rollerball pens fit the longer Schmidt refill, 4-5/8" long (8126). Please measure your old refill if you think this will work in your OMAS rollerball pen.