PermaSleeve® Commercial Grade Wire Markers provide business-class performance at a commercial price, so you can easily complete wire identification projects throughout your facility added cost. Great for electrical contractors, maintenance crews, industrial manufacturers and more, these heat-shrink sleeves provide permanent identification without any extra steps. Legible legends in temperatures ranging from -67 to 275° F (-55 to 135° C). UL224 Recognized. Brady Authentic materials work seamlessly with Brady printers for improved printer and material communication, seamless mobile app interaction, and better performance and reliability. A ribbon is required to print this material. Use Part Number M61-R4310 for the M610 / BMP61 / BradyPrinter M611 / M611 Label Printers or M7-R4300 for the M710 / BMP71 Label Printers.