Core"dinations Cardstock. Sand it; tear it; antique it; keep it! Every sheet of acid and lignin-free cardstock has a core color that coordinates with the surface color. You can choose to keep the core hidden or add your own creative touch by sanding tearing or antiquing. This package contains twenty sheets of 12x12in heavyweight cardstock with a light crosshatch texture. Available in a variety of colors: each sold separately. Imported.