We consider cork bark an essential part of any isopod habitat. We have not found an isopod that does not love to munch on it and hide in it. Cork is also often used for building structures or for as planters for the terrarium or vivarium. One of its great properties that it does not rot, even in very humid environments, so don't hesitate to use it anywhere, even in a paludarium!
Because cork is a natural product, the piece sizes may vary slightly from what is specified.