With most crafters using 100# cardstock as their heavy weight choice, 130# is significantly heavier. This is great for when you need something thicker. These will stand up to mild water use.
For your THICKEST choice, we also carry 160# (see separate listing). This is a lightweight board. You should not plan to fold it, as it is really too thick. Our watercolorist stampers love it! It will stand up to a good amount of water, but not the volume of water that watercolor paper does. However, your stamped images will be absolutely clear and crisp!