Features: Carbon fiber housing isolating external pressure, ensuring stable signal transmission. Rhodium plated connectors are selected, not easy to oxidize, which are firm, durable and not loose, and have good conductivity. Screw fixing connection mode, soldered free, easy to install and use. Insulated, suitable for 4mm banana plugs,spade terminals, or bare wire. Suitable for meeting room, home theater, power amplifier, speaker and more. Specifications: Material: Carbon Fiber+Rhodium Plated Color: Black+Red Size: Approx. 50x15mm/1.96x0.59inch Inlet Wire Hole Diameter: 4mm Connection Method: welding free/screw fixing Package Includes: 1 Pair Speaker Terminals note: Please allow 0-1cm error due to manual measurement. make sure you do not mind before you order. Please allow slight chromatic aberration due to different display resolutions.