Depends on where you look but the 9'5 Mana dimensions are all over the place.

The Naish web page states; 9'5 x 31 x 4 3/4
Magazine Adverts show it as; 9'5 x 31 3/8 x 4 3/4
The board itself shows; 9'5 x 31 x 4 1/2

For such a quality product, it's IMO a poor show that there is no correct consistancy.

I'm taking the board specs as being true and correct as it feels lighter, thinner and slimmer than it's 10' sibling.