We sell these in packs online or they are available individually in store. Westfoam 5mm White Foamboard is a rigid board with a smooth finish for a range of uses including model-making and mounting. Available in sizes A1, A2, A3 and A4. Made of acid-free paper and non-toxic, recyclable polystyrene, it's light, easy to cut with a craft knife, and has been treated to resist yellowing. Size A0 is available in packs of 25 here. Sheet sizes and quantities Westfoam Board 5mm in size A0 (pack of 25) is available to buy online.