Morning. Looking at my bench edge-wise, it's particle board 1 1/2 inches thick. It also has a laminated top. I found it in the attic of a house we bought one time. It is heavy and very sturdy without any give. I ended up bolting it to the top of a Black and Decker Workmate as I was a bit limited on space. I use a RCBS Rockchucker press.
Regards.