Special Tips are designed to produce circulars in 16″ (40cm) length. Each tip measures 4″ (10cm) and is to be used with a cord of 8″ (20cm) length. Specially designed to produce 40cm length (cord + tips). To be used specially with a cord length of 20cm (Product: KPR800101). A revolutionary product!! New - age needles made from High - Tech carbon fiber with tips in electroplated brass! A combination of two versatile materials - light bodied carbon fiber & sharp brass tips - is guaranteed to provide an unparalleled knitting experience!! No other knitting needle comes closer to this!! Carbon fiber is one of the most versatile materials used in manufacture of the new generation aircraft, space ship, automobiles, etc.!! Shiny, smooth brass tips come in perfect points flawlessly tapered - Ideal for all types of yarns and every project. The needles have high tensile strength, are lightweight with a lot of flexibility. Surface made of carbon fiber helps the stitches move smoothly on the needle!! Warm to touch & gentle in the hand. The size range from US 2.5 (3.0mm) to US 10 (6.0mm) are ideal for lace knitting, sock knitting, etc. Customizable cord length. Excellent for socks, and projects with high stitch counts. Note: Total length of 16″ is achieved when tips and cord are joined together.