Daler-Rowney Mounting Board is a versatile mount board, suitable for professional framing and presentation. It has a neutral pH and the surface paper, core and backing are all specially treated to minimise the effect of pollution and increase its durability. These packs come in the following sixes: A4 sheets, pack of 12 A3 sheets, pack of 8 A2 sheets, pack of 5 All mountboards are 1.4mm thick.