RFlex® Cable Assemblies Rosenberger RFlex® Cable Assemblies features RTK Flex 402 cable providing maximum flexibility and triple-shielding (relative shielding of -100dB minimum). The Rosenberger connectors on either end feature gold-plated center contacts, passivated stainless steel coupling nuts, and PTFE dielectric. Rosenberger RFlex Cable Assemblies offer excellent performance over a broad frequency range (-20dB return loss typical at DC to 18GHz), and the over-molded strain relief is rugged and durable.