In the case of shipping boxes, we use three- or five-layer natural corrugated cardboard.
For the K90 and K105 sizes we use the cardboard with B flute (approx. 3mm) and grammage of 450 g/m2.
For the K130, K150, K180 and K200 sizes we use the cardboard with BE flute (3mm + 2mm) and grammage of 660 g/m2.