DRY-SHRINK Thin Wall Heat Shrink, 1.0 Inch (25.4 mm) Diameter, 0.500 Inch (12.7 mm) Maximum Recovered Inside Diameter, 6 Inch Lengths, 7 pieces, Multi-Color (Black, Clear, Red, Yellow, Green, Blue and White). Small package fits easily in tool box. Applications include insulating, protecting and color coding wires and cables. 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 Recognized and CSA Certified (except Clear), Military Specification AMS-DTL-23053/5 Class 1 (colors) Class 2 (clear) (material performance only).