100% cotton
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2x2 ply construction

It’s sold in a number of different put-ups, some labeled only with yardage, others with yardage and actual weight. The most common put-up is 125m/410 ft/137 yards with a nominal weight of 50 g. Adjust stash entries accordingly. Nominal thickness is 1mm, but in practice, it feels thinner, similar to Size 10 crochet