Daler-Rowney Mounting Board is a versatile mount board, suitable for professional framing & presentation. It has a neutral p H & the surface paper, core & backing are all specially treated to minimise the effect of pollution & 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. Â