The Reflex cable is more torsionally resistant to corkscrewing than the current breed of textile cable. Braided stainless steel wire filaments over braided polyester core transmit torque to head swivel through both tension and compression for faster furling (textile cable transmits through tension only).
Use 3/8" Reflex Torsion Cable with the Harken Unit Reflex furler or with any other furler brand that requires a 3/8" torsion cable.