5.8.2019 Always trying to improve our product quality, we've upgraded all of our PCBs to "golden" ENIG plating (Electroless nickel immersion gold). ENIG plated boards have a little bit better surface planarity, they offer a better resistance to oxidation (if you take the boards out of their vacuum bags early) and are a bit easier to solder, as flux and solder more easily bond with the gold surface. Enjoy! :)