Knitter's Pride Dreamz Special Interchangeable Knitting Needle Tips are made of birchwood that provide sharp and sturdy points, making them easy to work with. The different colors help determine the difference in the needle sizes, and have specially designed tips that are shorter than standard tips. They produce 16” in length when combined with the 16” cable. Availible in a variety of sizes. *It's best to tighten your needles by holding the base.*