These page protectors do not hold 12x12 scrapbook pages, especially if you put any dimensional embellishments on your pages. I had to cut 1/4 inch off each of my pages just to get them to slip in the protectors and my pages still curled and buckled.
These are very sturdy stock paper. They went into my album and fit very well. I don't have any of my papers or stuff sticking out like other reviewers said, everything fit wonderfully. I absolutely love my album, it's going to be a memory book for my Daddy. It holds all of the pictures and a LOT of his newspaper articles. My sister loved it so much she had me order one for her as well. I needed 3 extra packs of these refill pages to complete it.