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In page Knitting:

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Yarn for hand-knitting is usually sold as balls or skeins (hanks), and it may also be wound on spools or cones, which is useful for machine knitting. The yarn used for knitting is typically sheep wool, acrylic yarn, cotton, mohair, cashmere, alpaca, or linen. They can be found in a variety of colours, and various speciality yarns can also be found, e.g. glitter yarn.[citation needed]