A very fine interconnect, available in DIN-DIN, RCA / DIN and even RCA-RCA formats.
The DIN plugs used, the Air Plugs, are a little on the fail side. Indeed the whole premise of Hi Line is that the cable hangs loose, unencumbered and that the plugs are nicely centred on the DIN sockets.
Repairing these Air Plugs is not an issue. For buyers of these cables new, Naim do not charge.