SPIN cables allow your tips to swivel freely! They are made of a pliable, clear nylon. This 8" (20 cm) length can be used with our 4" (10 cm) tips to make a 16" (40 cm) circular or connected to other cables. 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. TWIST tips will work with SPIN cables. For sizes Us9 (5.5 mm) to US15 (10 mm)