Closeup white polystyrene foam on the cardboard. Polystyrene foam is cushioning material in packaging, material for craft applications and other Stock Photo - Alamy
Elmers 900510 CFC-Free Polystyrene Foam Board 40 x 30 White Surface and Core 25 per Carton - Newegg.com
UCreate Foam Board - Art, Craft, Mounting, Display, Classroom Activities, Frame, School Project - 20"Height x 30"Width x 187.5 milThickness - 25 / Carton - White - Polystyrene - Thomas Business Center Inc