Season 4 Episodes13
Cast1

Lynn Herzeg
Narrator (voice)
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Ranked #5 of 13 in Season 4•+0.1 vs season avg
Precision metal tooling is machined into plastic injection moulds, filter media and metal components are assembled into automotive oil filters, sheet steel is cut and formed into filing cabinets, and molten glass is shaped by hand using traditional glassblowing techniques.

Lynn Herzeg
Narrator (voice)
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"Plastic Injection Moulds, Automotive Oil Filters, Filing Cabinets, Blown Glass" is episode 2 of How It's Made season 4. It scored 7.6/10 from 36 votes, ranking #5 of 13 episodes this season (season average 7.5). It aired on January 11, 2004.