These cards can be used for library labels in your classroom library. I printed them on cardstock and laminated them. I laminated the blank ones as well in case I need to add categories throughout the year and can just use dry erase marker. The numbers currently on the labels are Accelerated Reader levels, however each card label can be changed in Microsoft Word. To change the labels, select the text box and type. Text appears different on cards in picture than the actual document. Enjoy!