Clear Polyolefin Round Heat Shrink Tubing - 10 Feet Insulation from environment and resistance from water, fungus and UV light. Use for insulation and repair, wire and cable harnessing/bundling, cable and connector protection, and wire and tubing splicing and connecting. Specifications Operating temp: -55C to 135C Approximate shrink ratio: 2:1 @ 121C Dielectric strength: 500V/mil (197kV/cm) Volume resistivity: 1014-cm Before/After inner diameter (in.): 0.75/0.375