ChiaoGoo Twist cables have been designed to connect to all ChiaoGoo interchangeable knitting needles and Tunisian crochet hook tips. Made from memory-free, multi-strand steel with a red nylon coating, they are both highly durable and flexible! For a longer cable, simply connect cables using a ChiaoGoo cable connector. On both ends of the cable see multifunctional tightening holes which can also be used for adding a lifeline! To connect tips to the cable, simply insert the included T-shaped tightening key into the tightening hole and twist.