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TIL that thread is measured in lengths called Lea (120 yds/110 m), Hank (a length of 7 leas) and Spyndle (14,400 yards/13,200 m), and Thread (54 inches/1.4 inches). Denier refers to the weight (in g) of 9000 m of thread. A single thread of silk 9000 m long weighs about a g, so it's 1 denier.

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