DAMP-SHRINK Dual Wall Adhesive Lined Thin Wall Heat Shrink, 0.75 Inch (19.1 mm) Diameter, 0.313 Inch (8.0 mm) Maximum Recovered Inside Diameter, 48 Inch Lengths, 5 pieces, Black. Material Type is Polyolefin Cross-Linked with adhesive. For damp locations, Semi-rigid tubing. Adhesive inner wall seals and protects components from moisture and corrosion, Provides a rugged seal against the elements. Shrink Ratio is 2.5 to 1 Minimum. Temperature Range is -67 degrees Fahrenheit to 230 degrees Fahrenheit (-55 degrees Celsius to 110 degrees Celsius). Voltage Rating is 600 Volts, UL Recognized, Military Specification is AMS-DTL-23053/4 Class 1 (material performance only).