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. Product image shown covers a range of cable sizes.  
The new Shortie Blue X-Flex Cables will fit all Shorite tipes marked [S] - this includes sizes 3.5mm (US 4) through 5.0mm (US8). 
X-Flex blue cables come individually in 2" (5cm), 5" (13cm), 6" (15cm) and 8" (20cm) lengths.