This is a shitajiki or other words a pencil board/underlay and is 10 X 7 in size.
These are used in Japan for placing under a sheet when writing to give a smooth constant surface.
Highly collectable in Japan and come in various designs mainly in anime. Hard to obtain outside of Japan so this was ordered directly from Japan and shipped to the UK.
#shitajiki #supermario #mario #luigi #nintendo