A2 420mm x 594mm (16.5" x 23.4"). A3 297mm x 420mm (11.7" x 16.5"). 2mm thick board (2000 microns) - 795gsm. A4 210mm x 297mm (8.3" x 11.7"). 1mm thick board (1000 microns) - 430gsm. THICK HIGH QUALITY LIGHTWEIGHT TWO SIDED BLEACHED UNCOATED PRIMARY FIBRE BOARD / CARD (BEER MAT - COASTERS MATERIAL).