ChiaoGoo TWIST Small Red Cables for Interchangeable Sets [S]

From the ChiaoGoo website:

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. SPIN tips will work with TWIST cables. Available in small [S], large [L] and MINI diameters.