Wraps Per Inch. You can determine the WPI for a yarn by wrapping it around one inch of a ruler and counting the number wraps. The higher the WPI, the tinner the yarn. See also WPCM.
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Wraps Per Inch. You can determine the WPI for a yarn by wrapping it around one inch of a ruler and counting the number wraps. The higher the WPI, the tinner the yarn. See also WPCM.
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