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Polyfiber Medium

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death trap

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I have two rolls of Polyfiber Medium, both certified. One is Marked Medium 5 the other is marked Medium 4 . I could not find the meaning of the 4 & 5 in the Polyfiber Manual or in the Airspruce Catalog . Only difference I could tell was the 5 is 73” and the 4 is 72”
Thoughts ???
 

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