The corrugated cardboard for these boxes consists of acid free, age resistant archive cardboard and meets the requirements of DIN 6738, ISO 9706, ISO 16245. Consequently, the boxes are well suited for protecting valuable art treasures and documents from light, dust and atmospheric impact. The box for format A4 is made of 1.6 mm microwave cardboard (E-Wave). All the boxes feature a dove-grey exterior, with the wave and the interior being coloured natural white. The boxes are delivered in space saving 10 items or 25 item packages and are assembled quickly and easily.