Heat Shrink, Thin Wall, Cross-Linked Polyolefin Tubing, Color: Black, Conductor Range: 8 AWG - 4 AWG, Shrink Ratio: 2:1, Nominal Diameter: 3/8", Recovered Insulation Diameter: 0.185", Tube Length: 48". Recovered Wall Thickness: 0.022". Provides: Flame, Moisture and Abrasion Protection in Stain Relief and Wire Bundling Applications.