Students can use these cards to identify just right books for them in any library they visit. Most libraries in the school are labeled in some format, as well as teacher libraries. This allows the students to identify books they will be able to enjoy without having to worry about anything.
Student reading time will become more meaningful. Teachers won't have to worry about students reading books that don't challenge them.
I always print these on card stock and laminate them. They work great as bookmarks for my students!