Singly ply, slightly dampened compared to Remo equivalent. Coating seems harder wearing too.
I find with single ply more overtones and high end ring.
More brightness and while the sustain is less, generally quite sensitive.
They are the least durable batter heads so ideal for lighter playing styles (jazz, lighter rock, but they can also produce a big, boom sound for louder styles, just expect pitting and rapid wear.
Think I'm trying G2's next.
Also doesn't help if you take a heavy pair of sticks to them compared to some nice 7A's.