Black 5mm Foamboard - A1 Size (594 x 841mm) - Pack of 10Our 5mm Black Foamboard A1 Size (594 x 841mm) Pack of 10 is ideal for display, craft and home office use; its surface is receptive to pens, ink, gouache, pencils, pastels and pins. It's easy to cut and shape with a craft knife and is warp resistant with memory retention it won't dent easily. It also won't yellow over time, is non toxic and recyclable, making it a great environmental option.