Using these catalog cards is easy. First, grab a pen (since it's not included). Then, start filling out the 20+ fields on each double - sided card with details about your record, CD or other media. You can write down release information, where you bought it, your personal memories related to the item. Keep the stack of 50 cards in a safe place, like a storage box with your collection. Since they're designed and printed in California, they're of good quality. But be careful not to spill any liquids on them as it may smudge the writing. If you want to keep them in good condition for a long time, store them in a dry and cool environment. This way, you can enjoy documenting your music collection and sharing it with others for years to come.