Thanks, Tim!
It's called hexagrip and you can get it from Penn/Elcom in 4x8 sheets
it comes in 3/8" or 1/2" thick panels and the panel itself is a premium birch ply
I built many a case out of it in the past and it was wonderful to work with
-obviously "OCD" or whomever you are discussing can built cases out of many different materials of the customer's choosing
I used to do case-over racks with the shell made of the hexagrip and the interior rack made of 3/4" birch using the bedliner type coating or nicely stained and clear poly coated if the customer wanted