Silly request. DBrand mailers

Anyone have any idea who their supplier is or where to get similar mailers?

These have a reflective chromeish inside with a robust bubble mailer outside.

I asked them a year or two ago when they were just the basic black mailers and they were secretive and wouldn’t disclose the source.

Kind of silly but I do a decent amount of online sales and bubbles mailers are not made equal at all. I’ve tried to find these exact ones. They’re very sturdy. Few mils thick on the edges. No dice!