Uni-Ball Vision Rollerball Pen - Micro Point Type - 0.5 mm Point Size - Black - 1 Each. Vision Rollerball Pen features an innovative system that regulates a steady flow of waterproof ink to the point for consistent smoothness and color intensity. Solid stainless steel point is quiet responsive and won t bend under pressure. Uncapped pen offers a visible ink supply. Uni Super Ink helps prevent check washing. Ink is also acid-free fade-resistant and water-resistant. Nonrefillable.