Eastburn wrote:
Interesting dimensions - the paper I mean - must be
metric paper type. under 17 but over 11.

The paper size is called A3. It is not 'metric' but 'ISO 216' or 'A
series' and is used in most of the world. Each size is exactly double
the size below.

Thus A3 drawing paper is exactly double the size of A4 office paper.
A1 flip chart paper is exactly 4 times the size of A3.

More info at:
http://www.cl.cam.ac.uk/~mgk25/iso-paper.html