HEAT SHRINK TUBING provides insulation when shrunk down, and ensure a secure fit on cables with a 3:1 shrink ratio. Pre-sized tubes, continuous also available. UL recognised as a componant to UL224. Meets MIL-M-81531, MIL-STD-202G, SAE-DTL-23053/5 (Class 1 & 3). This cartridge is compatible with the Dymo XTL-500 printer ONLY.