C6 (11,4x16,2cm) format is one of the most popular format of envelopes. This format is often called by our clients a „standard letter format” (A4 papersheet folded into 4 equal parts). We can offer you the widest choice of C6 envelopes in Poland, from classic white smooth envelopes to unusual coloured. You can choose from not only smooth but also textured envelopes. Moreover we can also provide our clients with metallic pearl envelopes often found as the most elegant and sophisticated.