DRY-SHRINK Thin Wall Heat Shrink. Color is Opaque. Material is Polytetrafluroethylene (PTFE), 0.750 Inch (19.1 mm) Minimum Expanded Inside Diameter, 0.524 Inch (13.3 mm) Maximum Recovered Inside Diameter, 48 Inch Lengths, 5 pieces. Semi-rigid highly heat resistant Heat Shrink offers widest temperature range of any heat shrink material. Applications include insulating and protecting wires and cables. High temperature, strain relief, resists corrosive atmosphere, self lubrication and non-wetting. Can be used with fiber optics and as a strain relief for high density connectors. UV resistant. Voltage is 600 Volts. Shrink ratio is 2 to 1. Military Specification is AMS-DTL-23053/12 Class 3. Temperature range is -400 degrees Fahrenheit to 500 degrees Fahrenheit (-240 degrees Celsius to 260 degrees Celsius).