This is the refill I place in each and every roller ball that I sell. They are smooth, easy writing refills. The ink comes from the pen with a capillary action instead of pulled from the pen as in a ball point. Almost no pressure required, just the weight of the pen. Very easy on the hand for those who write a lot during their day.Remember, quantity and price are for (2) each of the refills and include shipping by USPS standard mail. Be sure to specify color when ordering.