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. Available in both small [S] and large [L] sizes, please make sure that you are purchasing the size of cable that will work with your tips!