Furutech FP series RCA Connectors. These are the FP series, but I have not been able to find the specific P/N for them. They most closely resemble the OCC Copper Pin FP-108, but look to be either Rhodium or Silver plated. They are the solder style, Locking Plug. If You've never used the Locking/un-Locking style before, You'll be very pleasantly surprised with these.
$94.95, Priced per set of Four. Five sets available.
Free USPS Priority Mail shipping for purchases of Two or more Sets.