Beryllium-Copper         

is stronger, more conductive, and better sounding than normal phosphor-bronze connectors.

Direct-Gold 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 and screw into place.