Excellent for applying color coding to documents. Safe for practically all types of documents. Writer-friendly and reusable. Post-it® Notes' paper comes from responsibly managed, certified renewable forests. Using 1 in x 3 in Post-it® Ultra Color Page Markers to color code your documents is a great idea. You can use them on almost any document without risk. Like a flag and a Post-it® note combined, they function. 40 sheets per pad and 4 pads per pack.