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. Meets MIL-M-81531, MIL-STD-202G, SAE-DTL- 23053/5 (Class 1 & 3) UL recognized as a component to UL 224.