Use these 3" x 2" direct thermal labels with your ZEBRA ZQ 520 mobile printer. THESE ARE NOT COMPATIBLE WITH ZEBRA ZQ 510 PRINTER - they will not fit as labels would need to be peeled off to about 170 labels. These bright white direct thermal labels for inventory, visitor badges, and in many other applications. Compatible with Fellowship One church visitor software. Software should be set for no timing marks which is the default setting.