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Ply refers to the number of strands a yarn is composed of. The term ply is misleading. Some people assume that the more plys a yarn has, the thicker it is. Not true. Some bulky yarns have only 2 plys and some multi-ply yarns are as thin as baby/fingering weight. It is better to look for yarn in terms of weight such as baby, sport, worsted, bulky, super-bulky. These refer to the thickness. This is also how most yarns are labeled.
  It depends on the type of irregularity. The most common is called a slub. Slubs are short sections of the yarn that are wider than the areas on either side and are eithe â¦ r not twisted or not twisted as much as the rest of the yarn.he lengt â¦ h of yarn in a hank varies with the market and the material; for example, a hank of cotton yarn traditionally included 840 yards (768 meters) of yarn, while a hank of wool yarn was 560 yards (512 meters).