Need Help Identify this material??

[Leebee]

I have pic from a broker that needs a quote for large signs for their customer. They are not close to me physically and they have provided detailed pictures.
All is good except I cannot identify the substrate.
Give it a try and If all else fails I will send a guy down there. just trying to avoid it.
BTW the substrate is 1/2" not 1/4". Not my pic.lol

Thanks!

 

[Leebee]

Another pic for clarity.

 

[GaSouthpaw]

Just looks like MDO or some other type of plywood to me.

 

[2B]

I agree, with it being 1/2" thick and the edges having those cracks in them in the second picture