Ultra thick box board used as a sturdy backing for prints, 910 gsm (1500 µm).
We have trimmed them to give 1 mm clearance each side of A5, A4 or A3 prints –
For A5 (148 x 210 mm) prints: 149 x 212 mm backing card
For A4 (210 x 297 mm) prints: 212 x 299 mm backing card
For A3 (297 x 420 mm) prints: 299 x 422 mm backing card
If you need another size please get in touch.