[Closed Design with Double Screws]Banana Plug Audio Connector, 24K Gold Double Screw Lock Speaker Connector for Lifetime Use with Signal. Isolate the wires and prevent from shorting out, and two set screws the wires are connected securely. [Easy Installation/Material]Banana plugs make speaker wire installation a breeze, perfect for use with A/V receivers, amplifiers, surround sound , banana wall panels. Material: pure copper, gold-plated, pure copper, non-magnetic. [Speaker wire suitable for many sizes]Accepts wire size up to 4mm. Compatible with 8AWG to 20AWG speaker wire. Double screw locking, no welding. Accepting 8awg to 20awg speaker wire,size up to 4mm High Quality ! Colour:black Material:Metal Package Contents: 10 x Banana Connector 4MM Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.