Another one of my all-time favorite pens, the Pentel Slicci 0.25mm still lives up to the hype. You don't hear much Slicci talk these days, but this is a pen you should keep handy in your arsenal. Some people are not fans of the thin barrel diameter - which is understandable - but the line is one of the sharpest, cleanest, and most consistent around. It passed the #OnePenOneDay experiment with flying colors.