A ballpoint pen dispenses viscous oil-based ink by rolling a small hard sphere, usually 700–1200 µm and made of brass, steel or tungsten carbide.[1] It automatically sends ink out from a little ball.The ink dries almost immediately on contact with paper. This type of pen is generally inexpensive and reliable. It has replaced the fountain pen as the most popular tool for everyday writing.
A rollerball pen dispenses a water-based liquid or gel ink through a ball tip similar to that of a ballpoint pen. The less-viscous ink is more-easily absorbed by paper than oil-based ink, and the pen moves more easily across a writing surface. The rollerball pen was initially designed to combine the convenience of a ballpoint pen with the smooth "wet ink" effect of a fountain pen. Gel inks are available in a range
A rollerball pen dispenses a water-based liquid or gel ink through a ball tip similar to that of a ballpoint pen. The less-viscous ink is more-easily absorbed by paper than oil-based ink, and the pen moves more easily across a writing surface. The rollerball pen was initially designed to combine the convenience of a ballpoint pen with the smooth "wet ink" effect of a fountain pen. Gel inks are available in a range
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