WR-CAB Flat Ribbon Cables Würth Elektronik WR-CAB Flat Ribbon Cables come in pitch options of 0.635mm, 1mm, and 1.27mm. These gray flat cables feature 4 to 64 pins and a voltage rating of 150VRMS or 300VRMS. The series is available in a wide variety of lengths, including 1m pre-cut cables for easier design-in and faster prototyping processes. Würth Elektronik WR-CAB Flat Ribbon Cables are ideal for industrial equipment, test/measurement and instrumentation equipment, robotics, and electronic device peripherals.