A retractable pen is a type of ballpoint pen that has a spring-loaded ink cartridge which retracts and extends outside a protective housing. By clicking downward on the top of the pen, the tip is extended and locks in place at the bottom of the housing for use.
A retractable pen is a type of ballpoint pen that has a spring-loaded ink cartridge which retracts and extends outside a protective housing. By clicking downward on the top of the pen, the tip is extended and locks in place at the bottom of the housing for use.
Source: Wikipedia "Retractable pen" · CC BY-SA 4.0
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