Flutes run lengthwise (e.g., 24x36 board has a 36" flute) for strong, stable displays. Versatile and strong: Use as corrugated plastic board, large poster board, plastic cardboard, coroplast sheets, coroplast panels, plastic sign board, and chloroplast sheets for yard signs, protest signs, blank slate signs, school projects, crafts, and business advertising. Available in popular sizes: 18x24, 24x36, 24x48, 36x48, 48x96, and 4x8 ft sheets, and colors: black, white, red, yellow, green. Choose your perfect corrugated plastic board 18x24, 24x36, 24x48, 36x48 poster board, or 48x96 coroplast sheets for large or small projects. Our 4mm thick corrugated plastic sheets are heavy duty, waterproof, weather-resistant, and reusable. Perfect for indoor or outdoor use: garage sales, real estate signs, political campaigns, event signage, trade show displays, and creative DIY crafts. Smooth surface ideal for drawing, painting, and applying vinyl graphics. Use as poster board for protest signs, blank yard signs, display boards, or craft decorations. Easy to cut and shape with standard tools for custom designs. These plastic poster boards work as corrugated plastic sign blanks, reusable sign boards, plastic panels, and blank yard signs. Lightweight, easy to transport, and strong enough for both professional and personal use. Choose corrugated plastic sheets 24x36, 18x24, 24x48, 4x8 ft, and more for reliable, creative displays.