10mm MDF plus some bits of wood attached. This used to be a housing for an indoor boiler. It is far from perfect, but might make shelves for a shed or garage or something that doesn't need to be cosmetically perfect. It has been kept outside, but in the dry. The bottom of some of the MDF panels has swollen a bit in some cases, but in the main they are sound.
These are the dimensions of the items shown from left to right in the first photo:
1. 80cm high 69 cm wide
2. 96cm high 63 cm wide
3. (Cupboard door with vents) 88 cm high 57 cm wide
4. (Cupboard door with surround & one side) 98 high, 43 cm wide and 17cm deep.