I'm thoroughly impressed with the Monteverde Capless Gel Ballpoint Refill for Parker Ballpoint Pens in Fine Point. It writes incredibly smoothly and effortlessly, feeling like a high-quality rollerball. What's remarkable is how quickly the ink dries, even with the bold and rich lines it produces. The blue-black ink is deeply saturated, creating a unique and distinctive shade.One thing to consider is that, as another customer pointed out, the 'fine' line width is sommewhat broader than typical fine refills, much closer to a 1.0mm gel pen. Nonetheless, it's an excellent choice for those who appreciate smooth writing and a distinctive ink color.