I would strongly discourage use of these "magnetic" pages for ANYTHING!
Stamps and covers NEVER!
Photos (which these pages are supposedly designed for) will adhere to the pages over time so tight that you can only CUT them out of the album (and if there are photos on the reverse side, you've lost them!)
Even for recipes, I would be reluctant to use them, as the pages have a tendency to yellow and will bleed though paper such as newsprint.
It's so much easier to scan and save material to the computer than to try any of these "cheap" storage solutions. If you absolutely must use an album of some sort, buy the archival safe, 100% acid-free, page protector type of albums. They may be more expensive, but they will save your heirlooms for future generations and not risk having them wind up in the trash.
Here's one example of a "good" storage solution (available at most arts and crafts stores):
