DYMO XTL label makers print directly on continuous or pre-sized Heat-Shrink Tubes. Heat-Shrink Tubes provide insulation when shrunk down and ensure a secure fit on wires and cables with a 3: 1 shrink ratio. Constructed of flame-retardant polyolefin sleeves and tested to industry standards. Durable DYMO XTL labels are jobsite-tested and UL recognized to resist tough conditions and won't smear or fade. Built with industrial-strength adhesives, these labels stay stuck. NOTE: This item is suitable for use in the Dymo Rhino XTL-500 label printer ONLY. Not suitable for the XTL-300 or any other labellers.