Morris Products 68015 Heavy Wall Heat Shrink Tubing Flame Retardant, 8" Length, 3/0-400MCM Cable Range, 0.16" Thickness, 1.500" Pre-Shrink Diameter, 0.500" Post-Shrink Diameter Heavy Wall Heat Shrink Tubing Flame Retardant - Extremely durable and versatile Flame Retardant Shrink Tubing. 3:1 Shrink Ratio allows various shapes & contours to be accommodated with one size shrink tube Insulates & protects electrical splices & terminations where maximum flame retardancy & exceptional insulating & sealing characteristics are required High impact and abrasion resistance capable of withstanding severe mechanical abuse of U.R.D., submersible and direct burial installations Will not split or rupture during installation, even when overheated