New fourth generation G37 series connectors bring a new level of performance and reliability to the industry standard, twelve-channel DT12 format. The new allmetal backshell, constructed from hard anodized aluminum with reverse threads and an o-ring seal, locks in place with two set-screws into a series of castellations. The front connector shell is now constructed from stainless steel (male end) to prevent connector damage and keyway wear. Gepco's crack-proof neoprene insulator now has a bonded and scalloped design that prevents rotation. The critical part of the audio path, the electrical contacts have also been improved. Both the pins and sockets now feature a new 3 micron, mil-spec, gold plating for improved soldering and tarnish resistance. For the strain relief, the G37 features on oversized nut and rubber gland seal with an optional Kellem cord grip and heat shrink.