The 130991 is a B-342 PermaSleeve Marker, a heat-shrinkable sleeve designed for durable wire identification and insulation. Constructed from irradiated polyolefin, it features a 3:1 shrink ratio and is compatible with thermal transfer, dot matrix, and laser printing methods. The marker operates effectively within a temperature range of -55°C to +135°C and possesses a minimum dielectric strength of 500 volts/mil. As a UL Recognized Component that meets SAE AS23053/5 and SAE AS-81531 standards, it provides reliable, legible marking in demanding industrial and electrical environments.