It is a corrugated carton paper, so stripes can be on this fiberboard. As the name "fiberboard" implies, it has a lot of tiny fiber texture on the surface.

Some fibers are soft, but some are hard. The difference in hardness gives easily recognizable patterns to the cardboard.

This coarse paper is made of fibers which make it look like a wood.

To be a woodlike paper texture, a lot of fibers can be seen. In reality, fibers are pressed to produce this kind of paper.

Occasionally, randomly oriented flecks can be found.