Let's start from the beginning, namely with the cover and format of sketchbooks:
Hard cover, 44 sheets
Size 148x210 mm (slightly less than A4)
Soft cover, 16 sheets
Size 148x210 mm
The manufacturer states, "German high-quality Bristol paper, thickness 180g/m2". Through my experience, I can say that's what it is. The quality of this snow-white one side paper with a barely traceable texture met my expectations.
Of course, I tested the paper in full and noted several important points:⠀
In general, as you can have already understood, you can work with different materials in these sketchbooks and not be afraid for the behavior of the paper.