Efreecity&reg; New 20 pcs 24K Gold Nakamichi Speaker Banana Plug Audio Jack Connector Type: Audio Adapter/Converter Material : Pure Copper., gold plated, Pure copper made, non-magnetic. Package Included: 10 pairs ( 10 black + 10 red) Accommodate cable with wire size up to 4mm, Double screws locking, no soldering., Accepts 8AWG to 20AWG speaker wire Double screws locking