TWIST cables are memory-free! They consist of a multi-strand, steel cable coated with red nylon. Lifeline holes can be found at each end of these cables. Insert the T-shaped tightening key into the lifeline hole to assist with securing your tip/cable connection. The small barrel cords are for use with needle tip sizes US 2-US 8. The large barrel cords are for use with needle tip sizes US 9-US 15. Cable lengths given are length of cable only, please add the combined length of the needle tips you will be using to determine total assembled needle length.