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The metallic writing spheres for ballpoint pens are generally purchased from an outside supplier, such as a light metal manufacturing business.
A ballpoint pen is a writing instrument that dispenses ink via a metallic sphere at the pen’s tip.
There are two main types of ballpoint pens: disposable and refillable.
The heat liquefies the resin, which is injected into a die cast mold, cooled and removed.
Excess plastic is then scrapped away, and the pieces are polished, cleaned and sent to assembly.
In most ballpoint pens, the writing sphere is made from brass, although you can also use steel or tungsten.