It is the new TonePro Ink. Similar to what Sabian is using. This has a more controllable spray so they are able to form a more pleasing font.
The TonePro Ink adds warmth and cuts the overtones.
It was first developed by Morgan Gene Fluids for the printing of serial numbers on mufflers. It was refined and thinned out a bit for cymbals and heads.
Quite a story there for the curious.