<P> While hanks may differ by manufacturer and by product, a skein is usually considered 1 / 6th of a hank (either by weight or by length). One source identifies a skein of stranded cotton as being 8.25 yards (7.54 m), of tapestry wool as being 10 yards (9.1 m), and crewel wool as being 33 yards (30 m). </P> <P> In yarns for handcrafts such as knitting or crochet, hanks are not a fixed length but are sold in units by weight, most commonly 50 grams . Depending on the thickness of the strand as well as the inherent density of the material, hanks can range widely in yardage per 50 gram unit; for example, 440 yards for a lace weight mohair, to 60 yards for a chunky weight cotton . Special treatments to the materials that add cost, such as mercerisation or labor - intensive hand - painting of colors, can influence a manufacturer's desired length per unit as well . Knitters and crocheters rewind the hanks into balls or centre - pull skeins prior to use, in order to prevent the yarn from becoming tangled . </P> <P> Hog casings are sold in "bundles" or "hanks ." This unit of measure equals 100 yards (91 m). </P>

How many yards in a spool of yarn