Nickel newtone stings.
I tried these once on my Style One and was disappointed. They were warm, but dead and I couldn't get the volume I was used to. But recently I decided to try them on my M-2 with a hot plate because, well nickel for the pickup....
Wow!.... unplugged - best string choice ever. Warm, yet crisp and loud. The sound falls away just right! How a National should sound... to me anyway. All the bite and growl and still lively. Nice and loud with the sound falling away just right.
Plugged in... I don't know, haven't tried it yet. I know it will be great.