The Uniball Jetstream Retractable Rollerball Pen features a fine nib that measures 0.1 mm, making it perfect for fine and detailed lines. The ink is super smooth and quick-drying so you can avoid smudges, smears, and getting ink on your hands. This rollerball pen features a 0.1 mm nib, making it ideal for fine, detailed lines. With the quick-drying ink, you can avoid smudges, smears, and getting ink on your hands. The gel formula is smooth and pleasant to write with. The barrel has a sleek, transparent look in black. The barrel has a retractable design with a handy pocket clip. The ink is black and perfect for back to school, classroom or officesupplies.