Beryllium-Copper is stronger, more conductive, and better sounding than normal phosphor-bronze connectors.
Direct-Silver Plating looks dull because there is no distortion-causing shiny nickel layer underneath. It is optimized for sound.
Cold-Weld System for an ideal connection, better sounding than solder: Tighten Allen-screws with supplied tool to create an ideal connection between plug and conductor, then slide the no-magnetic-interference ABS casing over the banana screw into place.
Fits up to 9 AWG speaker cables.