Is a cartolina an instructional materials?

A cartolina, which is a type of thick cardstock or cardboard, is not inherently instructional material. It's a *medium* that *can be used* to create instructional materials. Think of it like paper – paper itself isn't instructional, but you can print or draw instructions on it. Similarly, you can use cartolina to make flashcards, posters, charts, or other things that *are* instructional.