Ballpen -

: Traditional ballpens use a thick oil-based paste that dries almost instantly, making them more water-resistant and less prone to smearing than gel or rollerball alternatives. Diverse Forms & Functions

The ballpen is arguably the most successful writing instrument in history, defined by its small rotating ball at the tip that dispenses a viscous, oil-based ink. Originally patented in 1888 by John J. Loud and later perfected for the mass market by László Bíró in the 1930s, it solved the leaking and smudging issues common to fountain pens. Today, it ranges from ultra-cheap disposables like the Bic Cristal to luxury heirloom pieces. ballpen

: The heart of the pen is a tiny ball—usually made of tungsten carbide, brass, or steel—seated in a precision-engineered socket. : Traditional ballpens use a thick oil-based paste