The symmetric version of the XLR use original Neutrik connectors. The screen is the same as for the RCA version in order to effectively protect the signals.
The symmetric mode is an increasingly used standard in the audio world.
In most situations, balanced connections provide superior performance. This technique is inherently immune to electrical interference. This is why the Mezzo XLR confirms the validity of the symmetric technique, micro-data is better defined and provide a more realistic sound image.