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Ballpoint pens have a hull, usually in two parts so the pen can be taken apart. A plastic trigger at the top part forms the button that you press to lock the pen.

The pen itself is usually in one piece, consisting of a plastic tube with ink and a metal tip. The filling rests under the top with a spring, so that when you press on the top, the pen is locked in the down position under strain.The trigger then usually extends through an opening in the side of the plastic, so that if you press this, it releases the spring and the pen shoots back up into the hull.

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