Tough yet light and flexible. 3M Single Wall Polyolefin Heat Shrink Tubing is the right choice for electrical insulation in many industrial and manufactured products. Rated for 135 °C (275 °F) continuous operation, all tubing is split resistant, mechanically tough, easily marked and resists cold flow. 3M single-wall polyolefin heat shrink tubing meets UL/CSA specifications and is available in a range of colors and sizes.