Mitsubishi Pencil Uni-ball Protec Water-Based Ballpoint Pen, 4-Pack Model Number: UB-155 Ink Color: Black Tip Size: 0.5mm Ink Type: Water-based pigment Brand new, unused. Uni-ball uses waterproof ink that won't run even if wet. The pen fits comfortably in any hand and is easy to write with for long periods without fatigue. It's a simple, classic cap-type ballpoint pen. Shipping is planned via Yu-Packet Post Mini. Thank you.