Boye 5-Piece Aluminum Double Point Knitting Needles,7-Inch, Size 0 Boye size 0 (2mm) knitting needles - double point Needle length: 7-inch Material: aluminum Designed for superior performance and perfection, the concave points help prevent dropped stitches. Founded in 1906, Boye Needle Company was the first American manufacturer of crochet hooks and knitting needles.