Areyourshop 50 Pcs Musical Audio Speaker Cable Wire 4mm Gold Plated Banana Plug Connector Gold plated for maximum signal transfer and durability. Stackable for bi-wiring or running multiple sets of speakers. Banana diameter about: 4mm, Length: 40mm Suitable for wire to 4 mm maximum Package Included: 50PCs (25PCs Red + 25PCs Black)