Sakura has developed the latest technology in the evolution of the ballpoint pen, a writing instrument that glides smoother than a ballpoint pen and doesn't bleed or blot through thin paper like ordinary ink pens or liquid rollerball pens. Dries permanent, water and fade proof. Extremely smooth writing, consistent ink flow to the very last drop. Gelly Roll Pen Moonlight Bulk 10 Fluorescent Pink- Luminous on white or black paper, however fluorescent colors will wash-out if exposed to direct sunlight. This pen has a 1.0mm ball that creates a 0.5mm line.