T6s XLR Plugs One hundred percent technology: The ViaBlue™ T6s series. ViaBlue™ T6s XLR plugs have contact pins made of bronze which are 24 carat gold-plated. The shells are made of aluminum. Cables up to 12 mm diameters can be installed. With the gummi break protection cables with 7-8 mm diameter can be installed.