Heat Shrink Thin Wall Flexible Polyolefin Tubing 600V Color: null Shrink Ratio: 2:1 Size: 2 Inch Expanded Insulation Diameter: 2 Inch Recovered Insulation Diameter: 1 Inch Tube Length: 100 Foot Reel. Provides: null Moisture and Abrasion Protection in Strain Relief and Wire Bundling Applications. 3M Heat Shrink Tubing FP-301 is a general purpose thin wall tubing that provides a balance of electrical physical and chemical properties making it ideal for industrial and military applications. This tubing has a 2:1 shrink ratio and provides flame retardant insulation for 600V rated applications. It has a flexible polyolefin construction that offers moisture seal protection.