The World's favorite rollerball ink pen for 20 years, pens in a Box of 12 Filled with Uni-Ball Super Ink, an advanced ink formula that bonds to paper fibers, fade resistant, water resistant, and acid free, resistant to chemicals that wash dye-based ink from checks Unique ‘Uni-Flow’ system ensures ink flows consistently to give you a smooth writing experience down to the last drop – so there’s no need to worry about the pen jamming or ink suddenly running out Bold, 0.7mm nib creates a fine, 0.5mm line that will work great for note taking or general writing, capped top stays put and ensures that this pen will never leak in your pocket Stainless steel tip with tungsten carbide ball ensures that this pen will never break when you need it the most