5mm Smooth White Foam Board. Packs of 4 . A4 to A1 5mm Smooth White Foam Board. Packs of 4 . A4 to A15mm Smooth White Foam Board. Packs of 4 . A4 to A1 - Vesey Gallery
Mat Board Center, Pack of 10 11x14 1/8" White Foam Core Backing Boards : Amazon.co.uk: Toys & Games
16 Pack A3 Foam Boards AHUNTTER Black 5mm Polystyrene Foam Core Sheets Large Styrofoam Board for Crafts (297 x 420mm) : Amazon.co.uk: Stationery & Office Supplies