SPIN cables allow your tips to swivel freely! They are made of pliable, clear nylon. This 30" (75 cm) length will make a 40" (100 cm) circular when 5" (13 cm) tips are attached. Lifeline holes can be found at each of these cables. Inset the T-shaped tightening key into the lifeline hole to assist with securing your tip/cable connection. TWIST tips will work with SPIN cables. For sizes Us9 (5.5 mm) to US15 (10 mm)