The strong and stretchy stocking material fits small, medium, large and very large cakes or balls of yarn. Open on both ends for double stranded work. As you use your yarn the stocking hugs the yarn keeping it from tangling or knotting up. Small enough to throw in your project bag ready for your next project. Strong enough to use over and over again. Perfect for color work, double stranded or mixed yarn knitting or crocheting. Works with Super Bulky to fine lace weight yarns.