Parker Rollerball Refill Medium Blue (Pack of 12) S0881250This refill is designed with Parker Rollerball FreeInk technology, providing a high level of performance with a consistent and fluid writing experience every time. For use with Parker rollerball pens, simply unscrew the pen's cap, remove the empty cartridge and insert a fresh refill for continued use. This pack contains 12 medium blue refills. Refill for Parker rollerball pens Parker Rollerball FreeInk technology for smooth writing Medium nib for