Stereo & Electronics - Subthump stealth box thickness?

I checked the website but couldn't find anything about how thick the material is that they use. 5/8 0r 3/4

It's 3/4 "lightweight" MDF. It used to be listed on their websight but I looked and it's not there anymore. What makes it "lightweight"??? No idea. I have 2 of them and they are 3/4 MDF though!!

Thanks. I ordered the stealth Monday and it will be here Thursday.I can't wait to install it.