Hi Garic
the x value of a tippet material is that number subtracted from .011 to determine the diameter of the material. So a four x tippet is .007 . breaking strength varies by manufacturer. these numbers go back to when silk tippet materials were sized by drawing the raw(size 0x) silk fiber through a set of incrementally smaller holes so that a fiber drawn through three holes was said to be drawn three times or 3x.

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all leaders tangle; mine are just better at it than most. Jim