The specially-made 6.3mm plug is made of high-purity copper, which is almost non-magnetic, and the surface is thickly galvanized with 24K gold. The soldering wire in the plug also uses high-purity OCC copper.
Additionally, the Aluminum alloy housing and golden front cover make up a reliable all-metal body.
Desktop amps generally come with a 6.3mm output, often including a generic 3.5mm adapter. But the quality of that adapter is often inferior, so it’s recommended to upgrade to a premium adapter to avoid lossy sound quality from your device.