A patch cord is an electrical or optical cable used to connect ("patch in") an electronic or optical device to another for signal routing. They are basically connecting wires used in different circuits in educational institutes and electronics industry. They include | 2mm Pair Patch Cord | Stakcable Spring Loaded Plug | Brass Nickle Plated | 38 SWG O.D 3.0 mm | 42 SWG O.D 3.8 mm | Connecting Jumper Wire | Male to Male | Female to Female | Male to Female | 12cm | 16cm | 20cm | 24cm | all these are available in different shapes and sizes.