Your pen should provide years of trouble-free service but will need a refill cartridge from time to time. It ships as a rollerball (the super smooth, black, wet ink) but can also use a ballpoint refill. If you want a rollerball refill, look for the widely available Schmidt P8126 or P8127 capless rollerball refill. The "P" is important, a Schmidt 8126 or 8127 refill will be too long to fit this pen.
If you prefer a ballpoint refill (the oil based ink that lasts a long time but not as smooth writing) look for any Parker style ballpoint refill, also widely available.
If you experience difficulties finding a refill or if your pen needs repair please contact us.