I have collected trading/collectable cards since I was about 12 years old and I have always tried my best to look after them. It was several years before the Pokemon series came out and protection for the cards was not easy to find. I had shoebox upon shoebox of cards and always worried about them being damaged. Then when I was about 14 I was talking to a fellow Middle Earth player and he told me about A4 9-card sleeves, and gave me a couple of them to put my most precious cards in and the address of a dealer and I never looked back.
Many cards gain in value over the years, but only if they are in pristine condition so if you are going to collect cards or want to keep "shineys" or rare ones in outstanding condition then I would recommend these pages to you.
I usually purchase the "Ultra-Pro" or "MAX" 9 card pages as they don't contain the same level of harmful chemicals as cheaper brands. Display pages which contain chemicals such as bleach, or general acids or alkalis, can cause damage to the images on the cards.
These pages are made from a malleable plastic, which is not overly thick. They are a clear plastic which does not obscure the image of the card which they are holding, unlike some of the cheaper brands which have a milky, slightly opaque, look.
The company claim that you can leave the cards in these pages for long periods in direct sunlight. This is something that I have no intention of every testing. You should never leave your collectable cards in full sunlight, whether they are in UV protection covers or not.
The pages have 9 pockets which means that they can hold 18 cards back to back.
I would recommend that you use a 3 or 4 ring binder to store your pages as they provide a stronger hold and keep the pages more upright than 2 rings.
Other than storage, these pages can teach children (and adults) how to look after the things they cherish.