Kristin's Top Tips for Knitting with Circular Needles | Kristin Omdahl
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Switch Circular Needle Sizes When Knitting in the Round - PurlsAndPixels
What length circular needle do I need? — Frogginette Knitting Patterns
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Amazon.com: ChiaoGoo Circular 40 inch (102cm) Wooden Knitting Needle Size US 19 (15mm) 2040-19
Circular Needles - How to figure out needle size.
A Guide to Circular Knitting Needles and When to Use Them | Craftsy