I purchased two pairs of these to be used in a bi-amped 3.1 system but ended up keeping the setup in a 2ch full-range configuration and no longer need these. The cables have been well maintained and are in good condition with minor wear/discoloration on the connectors from normal use. The Castle Rock employs AQ's best copper conductor metal (Perfect-Surface Copper+), AudioQuest's Carbon DBS (Dielectric-Bias System) and NDS (Noise-Dissipation System). The connectors are the 1000 series BFA's from the WEL signature line and made using a "hanging silver over pure red-copper" process in which the spades and bananas are submerged ("hung") into a vat of extreme-purity silver, resulting in a very thick direct-silver plate. No intermediary performance-degrading materials (such as nickel or alloy) are used.
More information about the geometry and features of this premium cable can be found on AQ's website at: https://www.audioquest.com/cables/speaker-cables/flat-rock-series/castle-rock
. These are ultra premium cables that retail for $1500/pair in an 8ft length and I'm asking $799 shipped. At this price point, these are a phenomenal value and give plenty of margins if you'd like to have AQ re-terminate with spade lugs or even convert each of the cables to a single bi-wire configuration, which the geometry of the Castle Rock is particularly well-suited for. Post here with questions or PM with offers and I'll respond as soon as I am able. Thanks.