Megaform 250 4&rdquo; x 6&rdquo; Shipping Labels Self Adhesive Direct Thermal Label Roll 1  Megaform 250 Direct Thermal Label Roll Dimensions: Labels 4 x 6 / 1 Diameter Core High performance, low cost labels for use with Zebra, Datamax and many other direct thermal label printers Service temperature range from -75 to 200 degrees Fahrenheit Shipping labels, Identification labels, and many other usage