TWIST cables are memory-free! they consist of a multi-strand, steel cable coated with red nylon. this 50? (125 cm) length will make a 60? (152 cm) circular when 5? (13 cm) tips are attached. 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. please make sure your select the right size - small for sizes us2 through us8 and large for sizes us9 through us15.