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 cable length shown is for the cable only; the total length of the circular needle is determined by the length of the needle tips plus the length of the cable. Cables come in three diameters, designated as MINI, SMALL, and LARGE: MINI diameter cables are used with the following needle tips/lengths: US000, 00, 0, 1, and 1.5 (3, 4, & 5") US2, 2.5, and 3 (3") SMALL diameter cables are used with US2, 2.5, and 3 (4 & 5") US4, 5, 6, 7, and 8 (3, 4, & 5") LARGE diameter cables are used with US9, 10, 10.5, and 11 (3, 4, & 5") US13 and 15 (4 & 5")