Gel-ink ballpoint pen with new ink using new bead-pack pigment technology, which has been proven effective for writing more colorful and memorable letters. Fast-drying ink that prevents bleeding. Unlike typical quick-drying ink, our newly developed Uniball One Ink adjusts the solid-to-liquid ratio to ensure quick penetration without blotting or bleed-through. It dries fast without bleeding through to the other side. Size: Shaft diameter φ10.5mm x thickness 15mm x total length 139.5mmBall diameter 0.5mm / Ink Color: Black, Blue