The Uniball Jetstream Retractable Rollerball Pen features a medium nib that measures 1.0 mm, making it the perfect writing pen. This premium writing pen is made in Japan, the Blue ink is super smooth and quick-drying so you can avoid smudges, smears, and getting ink on your hands. This rollerball pen features a medium 1.0 mm nib, making it ideal for fine, and detailed lines. This is a Blue rollerball ink writing pen. With the quick-drying ink, you can avoid smudges, smears, and getting ink on your hands. The Blue ink is smooth and pleasant to write with. The barrel has a sleek, transparent look and has a retractable design with a handy pocket clip. This Blue writing pen is perfect for back to school, classroom or office supplies.