Riverside 3D™ Construction Paper is the only super heavyweight construction paper made with 100% recycled fiber content. It is 75% heavier and five times stronger than the leading national brand, and ranks #1 in color consistency among all groundwood construction papers. Durable sheets have a soft eggshell finish, and are perfect for building 3D models and a wide variety of STEAM projects. Acid-free. Sheets measures 18" x 24" .