3m Post-it 4 x 4 lined pop-up note pad refills Post-itŪ 4 x 4 Lined Pop-Up Note Pad Refills, Canary Yellow, 5/Pack Avoid running out of important notepads. Simply store these convenient refills in closets or desk drawers. These note pads utilize a unique accordion-style design that pop up, one-by-one, making sure the notes are always at the tip of your fingers. Notes are self-stick and removable. 100 sheets per pad.