I had been collecting vintage books for about 6 months. Some of them came with these mylar dust jacket protectors. I didn’t realize I could order them until I visited a local vintage book store and he told me to order them and put them on all of my books. After getting information about the manufacturer, I ordered these two rolls. They work wonderfully! I YouTubed how to install them. It is very easy. All you need is some scissors and tape. I had all of my dust jackets protected in no time!! Wonderfull product!!