3” Core Rolls: Thermal transfer printing offers top results for barcode and shipping information printing. In this method, a hot print head melts a wax ribbon onto the blank printing label. The result is a rugged, permanent print that is more than adequate for abrasive, demanding environments like shipping and mass storage. Our 3-inch core thermal transfer labels remain a popular choice for all types of applications. All types are compatible with Zebra printers and most industrial-sized printers. Also, nearly all types work well with Datamax printers.