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Close up of an extra fine roller ball pen next to something written with it. There are two main types of roller ball pens: liquid-ink pens and gel-ink pens.The "liquid-ink" type uses an ink and ink-supply system similar to a fountain pen, and they are designed to combine the convenience of a ballpoint pen with the smooth "wet ink" effect of a fountain pen.
Many other sizes were in use, however, before the Eversharp's success made its .046 inch lead size a de facto standard (this size has been variously metricized as 1.1, 1.18, and 1.2 mm, all nominal sizes). Thinner .036 inch (0.9 mm) lead was introduced in the later 1930s and gradually became the new standard, eventually being displaced by 0.7 mm.
Eversharp is an American brand of writing implements founded by Charles Rood Keeran in 1913 and marketed by Keeran & Co., based in Chicago. [1] Keeran commercialised Eversharp mechanical pencils (manufactured by two companies, Heath and Wahl), [2] [1] then expanding to fountain pens when the company was acquired by the Wahl Adding Machine Co. in 1916 and it was named "Wahl-Eversharp".
The line width depends on various factors like the type of ink and pressure applied. Some standard ball diameters are: 0.3 mm, 0.38 mm, 0.4 mm, 0.5 mm, 0.7 mm (fine), 0.8 mm, 1.0 mm (medium), 1.2 mm and 1.4 mm (broad). Pens with ball diameters as small as 0.18 mm have been made by Japanese companies, but are extremely rare.
In 1961, the Bic Orange was introduced, featuring a fine 0.8 mm (0.031 in) point and an orange barrel instead of a translucent one. Bic manufactures this pen in its own plants in Europe. In September 2006, the Bic Cristal was declared the best selling pen in the world after the 100 billionth was sold. [10]
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