Medium (commonly called worsted) yarn (weight 4):
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Knitting needles: 4.5 to 5.5 mm, or sizes 7 to 9
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Crochet hooks: 5.5 to 6.5 mm, or sizes I–9 to K–10 1⁄2
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Suggested gauge: 16 to 20 knit stitches; 11 to 14 crochet stitches
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Types of medium yarn: worsted, afghan, aran