The E3D v6 Copper Nozzles are manufactured from a high-temperature copper-alloy that will not soften until above 500C, this makes them perfectly suited for extremely high-temperature applications. With very high thermal conductivity, these v6 copper nozzles make for faster heat-up times and will perform well with most filaments on the market.
The nozzles are also nickel-plated. The nickel plating greatly reduces the adhesion of plastic to the metal, meaning they will stay clean, even without a silicone sock. In addition, E3D also managed to make them nickel plated internally, making extrusion much easier, more responsive, and less likely to jam.
E3D chose copper because of its high thermal conductivity, it has been hardened and treated to reduce oxidation at high temperatures. This will give faster heat-up times and tighter temperature control. Because the copper alloy was chosen is temperature resilient, it will not soften or anneal until well after 500C, making it the perfect E3D v6 nozzle for the extreme temperature applications.

Brass Nozzle: 0.4 mm
Thread: M6
Material: Brass 
Applied materials : PLA or ABS 1.75mm