"RedBubble posters are available in three sizes, with a maximum print area of A2, A1 or A0.
Posters are printed with a 5mm white border.
They’re printed on durable 180GSM matte stock. These posters are water-proof, which we discovered when James “washed” one in the sink. Although the print survived surprisingly well, we recommend ordering new posters in preference to scrubbing them under a faucet."
thats what the website says. i think its laser but im not sure..