2 items ... similar ...
1) Plaster board:- 1/2" thick (12 mm) 202 cm x 77 cm.
2) Solid foam insulation (Xtratherm brand):- 4" thick (100mm thick), 202 cm
x 77 cm.
Both plaster board and insulation have holes, so full size is not usable
(see photos, or ask me).
Dimensions approximate, but close.
Good for DIY projects, where you do not need a whole sheet of material.