They have a pocket and are about 3 x thicker than others which takes up a lot of space in a 1" binder. The package is not marked about being of thick cardboard/paper with a thick pocket.
The generous size (9 and 1/8 in. x 11 and 1/4 in.) covers sheet protectors containing papers allowing the tabs to be clearly visible in a binder. Each divider also contains a pocket. I purchased a pack about a year ago and I was so pleased to see they are still in stock; purchased two more. Highly recommend!!