Interchangeable Knitting Needles No. 4 (3.50mm) – Clover Needlecraft, Inc.
Knitting Needle Sizes and Conversion Chart (Free Printable) - Sheep and Stitch
Amazon.com: Coopay 14 PCS Knitting Needles 4 mm-10 mm, Single Pointed Plastic Knitting Needles Set Extra Long Straight Knitting Set 15.75in, Multicolored Sweater Needle Set Knitting Kit for Beginners
US size 4 (3.5mm) Circular Knitting Needles | Stitch & Story