These cards provide students with a visual reminder of their reading level based on the Zone of Proximal Development suggested for AR. I use the reports from assessments such as the STAR reading test & TPRI to determine their level. Then I highlight the correct levels on each student's card. My students bring these with them to the school library to help them find just right books.
I have another version of the cards available that have the months on them. I used to glue those inside their AR folders. I liked them because student could see how their reading level increase throughout the year.