Amazon
"This Backing board panel is 2.5mm thick and is made of MDF. It measures 10inx12in. Please note that size may be a few millimetres short, as some frames will have pins that the backing board needs to clear." This Backing board panel is 2.5mm thick and is made of MDF
"This Backing board panel is 2.5mm thick and is made of MDF. It measures 10inx12in. Please note that size may be a few millimetres short, as some frames will have pins that the backing board needs to clear." This Backing board panel is 2.5mm thick and is made of MDF