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Knitting & Crochet Yarn Size 4

4 Medium: Medium weight, worsted weight yarn, is the most common thickness in knitting and crochet. Worsted weight yarn is ideal for all kinds of knit and crochet apparel, accessories, blankets and other home decor items. It can be called Worsted Yarn, Afghan Yarn or Aran Yarn. Recommended knitting needles 7 to 9 (4.5—5.5 mm), crochet hook I–9 to K–10 1⁄2 (5.5—6.5 mm)