Flying Bus Cables (male pins) come as a pair of ribbon cables, with a total of 13 power headers. The cables plug direct into the Row Power. Simply plug your modules' power cables into the male headers.
The Flying Bus Cables can move around freely inside the case (only one end is anchored, where it attaches to the Row Power). This gives you more flexibility when clearance is important (you can nudge the bus cable around to make room for deep modules). This is an economical choice for power distribution.