These are required for use in Rocketbooks. After filling in the notebooks (and snapping images of the pages, uploaded to your cloud acct.), microwave the book and the pages are cleared for re-use. No need for the eraser at all, except for just-in-time edits. And no, I don’t work for Rocketbook. And a hair dryer works too if you just want to erase a few pages at a time.
