PermaSleeve® PS Heat-Shrink Polyolefin (B-342) wire marking sleeves combine speed, ease of use, and permanence to create long-lasting, high quality identification. - 3:1 heat shrinkable sleeve fit snugly around wires for maximum insulation protection and permanent identification - Fade-resistant and smudge-proof for superior aesthetic appearance - Cold resistant and flame-retardant with an operating temperature of -67°F to 275°F (-55°C to 135°C) - Meets SAE-AMS-DTL-23053/5C (Class 1), SAE-AS-81531, MIL-STD-202; RoHS Compliant; and UL Recognized