DYMO Heat Shrink Tubes for DYMO XTL Label Makers, Black on White, 1/2", 1 Roll (1868810) Heat-Shrink Tubes provide insulation when shrunk down and ensure a secure fit on wires and cables with a 3:1 shrink ratio Heat shrink tubing meets MIL-M-81531, MIL-STD-202G, SAE-DTL-23053/5 (Class 1 & 3) UL recognized as a component to UL 969 Compatible with all DYMO XTL label makers