Interchangeable tip extenders are accessories for the HiyaHiya interchangeable knitting needle system. These parts allow you to extend the length of the tip of your needle before it attaches to the cord. Each extender is 2" long, and they are sold in pairs. Be sure to order the correct size. Small extenders are for use with needle tips size US 2-8 (2.75mm-5mm), which large extenders are for use with needle tips size US 9-15 (5.5mm-10mm).