It does not seem to have any iron in the conducting part of the connector. Just the golden cock ring has some iron and I just cut it of (seems stupid to include it, the connector looks better all black) as it could act as a small filter (like a ferrite bead). The cap is aluminium but I dont see how it could affect the sound, a better solution may have been plastic like WBT connectors. These connectors are my go to as it seems to not affect the sound (compared with just wire) and are way cheaper than WBT.