Replenish the cartridge on your Type A or Type B CW&T Pen. With a choice of either .3mm or .5mm, you can tailor your pen for the writing experience and results that you want. These Pilot Hi-Tec-C refills are labeled as either Micro Fine (.3mm) or Extra Fine (.5mm), leading to more sharper, thinner lines as you write. Receive 2 refills with each order.