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. Features Constructed of flame-retardant polyolefin sleeves and tested to industry standards. Durable thermal transfer printing technology - label text won t smear or fade Meets MIL-M-81531, MIL-STD-202G, SAE-DTL- 23053/5 (Class 1 & 3) UL recognized as a component to UL 224 Temperature Rating: Max 257?F Best for: Wires & cables UV resistant Water resistant Oil resistant Chemical resistant Package contains: XTL Heat-Shrink Tube Cartridge, 1/2\"