The uni-ball Signo UM-120AC gel pen is perfect for journaling, writing and drawing on both light and dark paper. The opaque pigment ink is quick-drying, fade resistant and water resistant. Strong but smooth rollerball nib, ultra-smooth gel ink. The tip is a carbide ball with a diameter of 0.7 mm. Line width: 0.45 mm. The price is per piece, commercial packaging is 12 pieces.