4 Pack Foam Board 30"x40", 0.23 Inch Thickness White Poster Board, Double-Sided Acid-Free Foam Core Board, Large Lightweight Polystyrene Mat Board for Painting, Display, Craft & School Projects

6mm Thick Sturdy Core & Edge Protection (with
Plastic Corners): 6mm high-density foam core board offers solid support for paintings/presentations/crafts (no bending/warping). Each package contains plastic corner guards plus a shock-absorbing design, preventing shipping edge damage and solving "broken-board on arrival".
Double-Sided Smooth & Seep-Proof Surface: White foam board features a burr-free, double-sided smooth surface that prevents paint, marker, or glue from soaking through. It works effectively with watercolors, acrylics, and adhesives, eliminating the hassle of uneven coloring or paper peeling caused by seepage. Acid-Free Material for
Long-Term Preservation: Double-sided acid-free foam board (acid-free polystyrene foam + outer paper) neutralizes airborne acids, keeping artwork/photos from yellowing/fading. Ideal for archival storage/long-term displays. Lightweight Yet Rigid & Easy Precision Cutting: Lightweight foam core board is easy to carry (school/on-site use), while rigid construction stays flat. Smoothly cut with a utility knife (no jagged edges) for custom sizes/shapessolves heavy board transport/custom issues. Versatile for Multi-Scene Use (4-Pack
Value): The 30"x40" standard size suits diverse needs: school projects, office presentations, home crafts, cosplay props, and exhibition displays. The 4-pack white poster board provides enough quantity for extended projects, avoiding frequent reorders and saving time