This multigauge 8 conductor control cable is available in 250' reels or by the foot, uses a .490 grommet.   The red/black and the gray/orange wires each form a 14AWG twisted pair.  The green/white and the blue/brown each form a 20AWG twisted pair.  This cable can be used on System 21 and GCS300+ Systems, using their particular wiring method.