I just got in touch with the Kaman Music Corp. support group, and I am waiting for their response. I'll get back to you when I get that information from the horses mouth.
Thanks for that FYI. I don't need to take my kit apart to check for myself when there are other resources that are more reliable from the manufacturer.
Time will tell.
Copied and pasted from the Gretsch site below:
Custom drums feature the original Gretsch formula 6-ply maple shell that has been applied for over 50 years. Each drum includes 30-degree bearing edges, our original Silver Sealer inner shell finish and either Nitro-cellulose lacquer or Nitron exterior finishes to give you that "Great Gretsch Sound."
But in the meantime you can read this form the Gretsch website:
Gretsch USA Custom