I have seen a couple responses about directional cables and I hope I can clarify some of this. RCA cables can be made with coaxial cable and direction does not matter, there is a center conductor and ground (shield).
Some manufacturers claim the copper crystals align better in one direction over another so they mark what they believe is the best direction. Then you have microphone cable or similar with two conductors and a shield. The two center wires , usually twisted pair, have a signal line and ground. If you then attach the shield on both ends to said ground you have created a ground loop. What you do is connect the shield to the source end, and leave the shield off of the destination end. The arrow indicates signal flow from source to destination. That is the way I generally build interconnect cables. Another way to build with that cable is just like coaxial, you attach the two center conductors for signal and use the shield for ground, then no need to mark direction. PYST may do that.
Also stranded wire is more flexible than solid center conductor so PYST probably uses that as well.