Good quality MDF
Exactly what I expected. Nice square cut sheets that measure 600mm X 298.5mm X 3.1mm.  This is NOT the same as stringy hardboard aka Masonite (what tool hanger peg boards are made from).  It is just like the 1/4" MDF I get from Home Depot, but only 1/8" thick.  Great for laser cutters and CNC routers.
Rating: 5 stars