WE-RIB Ferrite Cable Cores Würth Elektronik WE-RIB Ferrite Cable Cores comprise Balun and multi-aperture EMI suppression ferrite cores designed with a NiZn core material. The NiZn core material ensures the cores can withstand high currents at temperatures below +200°C. WE-RIB cores are suitable for cable diameters ranging from 0.8mm to 3.55mm, making them ideal for applications in telecommunication data lines and Balun transformers. Würth Elektronik WE-RIB Ferrite Cable Cores offer reliable performance.