These longer, five inch tips are part of the interchangeable knitting needle system by HiyaHiya. The bamboo is wonderfully light and smooth. These are not complete needles, you need to attach them to cords to create circular needles. They will only interchange and attach to cords made by HiyaHiya. Be sure to purchase the correct size cords for the needles you choose. Small cords connect to needle sizes US 2-8 (2.75mm-5mm), which large cords connect to needle sizes US 9-15 (5.5mm-10mm).