21S/2 8# Cotton Crochet Threads, Mercerized Cotton Yarn, for Weaving, Knitting & Crochet, BlackSize: about 1mm in diameter, 50g/roll.â Gauge: 21S, 2-Ply, it belongs to medium count yarn, used for weaving plain cloth, twill cloth, satin and other general fabrics. â Mercerization: Mercerisation is a textile finishing treatment for cellulose fabric and yarn, mainly cotton and flax, which improves dye uptake and tear strength, reduces fabric shrinkage, and imparts a silk-like luster.
