Wardrobe sides (Great Rollright OX7)

Not sure what these are made of, (mdf?). They were supposed to be the sidewalls of a flatpack wardrobe but we never used them. The 2 panels are 37 x 175 cm black on all sides but they do have predrilled holes on one side, and some holes that go all the way through. They have been leaning up against a wall and now they aren't quite flat which you can see in the photos.
There are also 2 panels of the cardboardy stuff that goes on the back of the wardrobe one of which is about 1/2cm larger, and one is a double panel. They are brown on one side and shiny black on the other