Sumitube b2 IRRADIATED POLYOLEFIN BLACK 1 INCH 1" HEAT SHRINK TUBING MIL-DTL-23053/5C 200FT $149 71-94-5230-6085 200 FEET REEL FOR $129 Black 1" (26.6 mm) Flexible Polyolefin Heat Shrink Tube with a 2 to 1 Ratio - Sold by the Foot SUMITUBE B2 is a very flexible, flame-retarded, radiation-crosslinked heat shrinkable polyolefin tubing which meets all of the material and functional requirements of Military Specification AMS-DTL- 23053/5, Class 1 and Class 3. B2 is recommended for use in general purpose applications such as wire marking, color coding, and electrical insulation of light wire harness assemblies. For higher expansion ratio versions see B2(3X), B2(4X), and B2(4XC). This is high-grade, mil-spec polyolefin heat shrinkable tubing. Very versatile through excellent balance of chemical, electrical and mechanical properties. Shrunken size is approximately half of original diameter. Our standard color is black