Pentel Slicci Gel Ink Pen - 0.25 mm - 5 Color Set

...bought a set of these--also red, blue and black--about two years ago. Happy to say that couple years later, they still work fantastic, and the ink flow is still as smooth as new. I have the 0.25mm tips, and despite seemingly thin, the tips are actually pretty sturdy (sturdier than the Pilot G-TEC ones, which also happens to be my other favorite). These are some awesome pens for a pen-addict like me ;D

If your looking for pens that write extremely thin and flow out easy these pens are for you. Colors are great pens a little thin even for my tiny fingers and the 0.4 mm tip is still really really thing.