The 3.5 mm thick pressed cardboard sheet #14 in 74x90 cm format is the perfect dense and ultra-rigid support for high-quality bookbinding and box making. Manufactured from high-density pressed recycled fibers, it does not bend or deform under pressure, offering a solid base for book covers, albums, and rigid boxes. Its 3.5 mm thickness ensures maximum structural durability. Perfect for manual bookbinders, graphic arts studios, and model makers.