Explanation:
Barrel shell - Barrel the long part of the main body of the pen which houses the ink reservoir.
Ink tube - Any container or cavity inside a pen that holds ink is the ink reservoir. In non-refillable pens, the reservoir is a cavity in the pen body. A replaceable tube of ink is typically called a "refill" when it includes the writing tip, or an ink "cartridge" if it contains only ink.
Ballpoint - pens work differently than fountain pens, though they also rely on gravity to function. Rather than a nib, a ballpoint pen has a small ball bearing for the ink. As the ball moves across paper, it turns and draws ink from the cartridge, creating a consistent ink line with a quick dry time.
Cap - Pen caps have a small hole to prevent choking if swallowed and to equalize the pressure inside the pen to keep it from leaking. And pen cap basically serves the purpose of protecting yourself from the nib and everything else from ink.
AYAN NA PO ATE GIRL NA LAGING "SORRY HINDI KO PO ALAM"
