Made of three-layer corrugated cardboard with a weight of 390 gsm. Acid-free product (pH around 7.5). Type B wave. Spine width 155 mm. Capacity of up to 1,550 sheets of 80 gsm. Fits 2 A4/75 mm fasteners. The height of the box matches the height of the fastener. Features 5 holes for easy insertion/removal and 5 descriptive walls. Fits all bulk Donau boxes. Can be placed on the smaller or larger side. It has FSC certification. A4 format. Dimensions 155 x 340 x 297 mm. Blue color.