BFA Z-type 4mm Banana Plug. 2pcs/6pcs/10pcs/12 pcs/20pcs/50pcs/100pcs Copper BFA 4mm Z-Type Banana Plug. CCTV, Coax. CCTV System/ Coax. SMA & RF Coax. - A and C are 24K Gold Plated copper conductor, B is Sliver Plated copperensuring a consistently high level of performance and connectivity.