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To write is necessary to completely extract one of the two pens from the body, bringing the other inside. In the rest position instead the two pens must be placed at the same height remaining partially protruding from the front opening, and only in this position it is possible to close the pen putting the cap and refill them. The cap has in fact only the purpose of protection of the tips of two pens, since the ink is not contained in the barrel body but in the individual pens that are housed in it.

To write is necessary to completely extract one of the two pens from the body, bringing the other inside. In the rest position instead the two pens must be placed at the same height remaining partially protruding from the front opening, and only in this position it is possible to close the pen putting the cap and refill them. The cap has in fact only the purpose of protection of the tips of two pens, since the ink is not contained in the barrel body but in the individual pens that are housed in it.

[[Image:1933-12-Zerollo.jpg|thumb|left|A ''Zerollo'' advertising from 1933.]]

[[Image:1933-12-Zerollo.jpg|thumb|left|A [[Zerollo]] advertising from 1933.]]

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