This model of the NP3-* right-angle jack has the same black shell as the NP3-RX-BAu but has a hard silver alloy plating on the contact surfaces, an excellent conductor. This -BAG version is considerably cheaper than the -B (gold plated version), but it is just as good. It has exactly the same shell and cable clamp, plus I prefer the black finish, so I like this one and now it is not much more expensive than the standard nickel-plated type