This is a luxury item. It is slightly less than A5, at 5½ by 8¾ inches.
The paper is ivory watercolour paper, cold press, thick and stiff and totally opaque. The book opens out flat and has good solid covers. I somehow find the paper a bit boring to use: it has “tooth” rather than texture. It takes ink superbly.
I’m using this for sketches in Crete, for example this one: