2pcs BNC Male Plug to 2 x 4mm Banana female Socket Binding Post Adapter Pure brass with Great connectivity.(Not Alloy) Black plastic, dual port Banana Jack Socket for easier recognition, screws type, no soldering. This Banana jack look nice and provide a solid contact. Use Best Flame retardancy material. 5-12 Businese day delivery to USA Address if Fullfilled by seller.