What is a skein of yarn & the differences between hanks and balls.

A skein means yarn winded into an oblong bundle ready to use for knitting, crocheting, etc. It can also be used as a "unit of yarn".

How to wind a hank of yarn into a ball

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What is a Skein of Yarn & What's the Difference Between a Skein, a Ball and a Hank? - Little Red Window

Hanks, balls, and skeins - oh my! - Stitches n Scraps

What is a skein? Demystifying names for yarn bundles. - Shiny Happy World

My 3 Methods for Winding Yarn – Elizabeth Smith Knits

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skeiur - その他

What Is the Difference Between a Hank, a Ball, and a Skein?

What is a Skein of Yarn? Difference Explained Skein, Ball, Hank, and Cake - Easy Crochet Patterns