1000pcs Gold Plated Copper BFA Z-Type 4mm Banana Plug Speaker Cable Connector. Qty: 1000 pcs - 100% Brand new, never used, High quality - 24 Gold-Plated BFA z-type 4mm Banana Plug - These 4mm plugs are constructed from a tough low mass, gold-plated copper alloy conductor, ensuring a consistently high level of performance and connectivity. Installation of these speaker plugs requires soldering or crimping to give optimum sonic performance.The plugs can be piggy backed with other 4mm plugs and fit cable up to 4mm in diameter. Suggest to use with Heatshrink. It will be more convenient to both you and us. If you have any question. We hope you enjoy using our item. Our goal is to make sure you have pleasant shopping.