28 x 40 inches. Bring your ideas to life. www.elmers.com. Project ideas. Tips & how-to videos. Money saving offers. Sturdy corrugated board. Smooth surface. Self standing. Get great results! Use Elmer's adhesives, X-Acto knives & Painters paint markers to complete your project. Great for: science fair; school projects; business presentations. White inside. 100% recyclable. Sustainable Forestry Initiative. Certified sourcing. www.sfiprogram.org. Made in USA.