The cover is gray cardboard (1.6 mm thick), and the text is monthly pages only (no numbers, risograph printing).

Specifications
14 sheets (26 pages) of text, Y-grain, 100kg paper
2 cover sheets, 1.6mm thick ball board
B6 size (closed: 182mm (top and bottom) x 128mm (left and right) x 9mm (thickness))

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