Knitter's Pride Dreamz Interchangeable Knitting Needle Tips are made of beautiful birch wood needles and feature sharp points and a smooth polished surface. They are color coded by size making it easy to identify and organize your needle pairs. Tips for US sizes 4 through 11 are 4.5" long. Tips for US sizes 13 through 19 are 5" long. It's best to tighten your needles by holding the base.