This case is filled with 16 packages of 9" x 12" and 4 packages of 12" x 18" heavyweight construction paper for a total of 2,000 sheets. There are 100 sheets of 10 assorted colors per package. 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.