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