G.S.M determines the weight of paper in g/m2.
On the basis of this value, the exact weight of a postal matter can be calculated.

- In this way it is possible to cut postage costs.

Depending on the type, our envelopes are made of paper with the following G.S.M. values:

75 - 80 g/m2 for C6, DL, C6/C5, B6
   90 g/m2 for C5, B5, C4,
   100 g/m2 for B4
   and 130 g/m2 for E4.