DRY-SHRINK Thin Wall Heat Shrink VW-1 Flame Rating, 0.750 Inch (19.1 mm) Diameter, 0.375 Inch (9.5 mm) Maximum Recovered Inside Diameter, 48 Inch Lengths, 5 pieces, Black cross-linked Polyolefin Heat Shrink. Insulates a wide range of diameters and irregular shapes. Ultraviolet resistant material improves flame retardancy, chemical, and temperature resistance. Shrink Ratio is 2 to 1. Temperature Range is -67 degrees Fahrenheit to 275 degrees Fahrenheit (-55 degrees Celsius to 135 degrees Celsius). Voltage is 600 Volts. UL VW-1 Recognized. CSA Certified. Military Specification AMS-DTL-23053/5 Class 3.