Rotring Tikky Graphic Drawing Pen - Pigment Ink - 0.3 mm - Black Ink

A superior product. I use the .1,.3,.5,.8 for comic book pages. The .3 gets used about %80 of the time.
The tips are hard and durable but have some give when pushed hard. They never wear down or change shape. The .1 and .3 have great bounce and spring. Like other felt tip pens, the larger ones are stiffer.
The ink is very dark and never fades or comes up when I erase over it. I draw with hb lead on Strathmore 400 regular board and erase with a Rotring Tikky eraser. The ink flows out of these pens unimpeded. They are much Juicier then similar brands. That works great for me since I draw on a rougher board.
Without a doubt, though the best feature is the ink delivery system, I used these to replace Sakura Micron pens (also very good) and I went from drawing about 3 pages with the 5 micron, to 10-11pages plus several illustrations with the .3 Tikky before the ink started drying up. You really can use the pen until almost the last drop. I never noticed it gradually getting drier. It stayed basically the same until it suddenly dried up and stopped one day. You can even view the ink in the pen and see when it will run out. They are really big too, which may be bad for some, but it holds more ink that way.
The negative is the price, but for me it is worth it to eliminate the slowly drying up aspect of drawing with disposable pens. I have bought them in bulk from Rotring which cuts the price down per pen to something similar to the other brands, but it is great to be able to buy individual ones from Jet pens when I need them.