The thickness is 1mm.
Plates are mirror-like finished and protected by a plastic film.
Several sizes are available:
7x10cm / 10x15cm / 15x20cm / 20x30cm / 30x40cm / 40x50cm
Copper is the most used metal in intaglio becaue of its resistance, its flexibility, its ability to be finely etched and its good heat conductibility ( quality for inking and wiping and also for applying certain grounds and cooking correctly rosin aquatint).
The mirror-like finish does not retain much ink and gives a white background to the prints.