Couldn't have said it better myself Mr Fields...

Brown envelope included...

The exact dimensions when folded are:

105mm x 148mm
4.13 inches x 5.82 inches

A satisfyingly heavy paper with a smooth, satin finish. The insides are unlaminated, to make them easier to write on. The paper is 10% recycled post-consumer fibre, and it is acid and Elemental Chlorine free.