Uniball One 0.7 Pen 70363, Blue Gel Ink, 0.7mm Medium. Gel Pen with a 0.7mm tip features "One" ink for supremely smooth, ultra-vivid results. Super Ink technology protects against water, fading and fraud to ensure your writing stays visible and safe. Modern, minimalistic design with a strong, spring-loaded clip ensure this pen is perfect for use in offices, schools, homes and more.