US ART 20x24 Inch Foamcore Backing & .060" Acrylic Sheet for Picture Frame Poster Frame This Acrylic Sheet & Foam Backing fits a 20x24 Inch Frame. This Premium Upgrade listing Includes : Clear .060 ACRYLIC Facing and Acid -free white Foamcore Backing Foamcore & Acrylic material is a high quality, crystal clear, durable upgrade from styrene plexiglass. US ART 20x24 Inch Foamcore Backing & .060" Acrylic Sheet for Picture Frame Poster Frame Foam backing & Acrylic sheeting provides added protection and crystal clear clarity for your print.