Cardboard has many variants.
Acid-free photo cardboard. Cardboard printed on both sides. Corrugated cardboard or corrugated cardboard. Matte and gloss cardboard. Large sheets and small sizes. Depending on the thickness, just suitable for punching out figures, or perfect for use as the cover of an album.
Cardboard is available in various thicknesses, for example, we have
Cardboard in a thickness of 250 grams in various sizes
Cardboard in a thickness of 300 grams in various sizes