Ball point pen body (outside protection):
-Metals
-Plastics
-Copper or Brass
- Sometimes aluminum
-Many other chemicals
Ball point pen insides (Inside pen):
-Tungsten carbide ball (The ball point)
-Plastic (the ink holder)
-Customized or selected colored ink
-Brass (Spring)
And that's your classic ballpoint pen, its more complicated than it looks :)
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