Gel ink in the pen is super smooth, and has a vivid pigment that will stand out from the rest, black Ink 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 Vibrant gel ink doesn't skip or stutter, even on glossy paper, and gives bold, easy to read lines Broad 0.6mm writing line is ideal for anyone with a large or bold handwriting style Rubber grip makes this pen comfortable and easy to write with, capped top stays put and ensures that this pen will never leak in your pocket