Single wall black heat shrink tubing with a 1/2'' nominal diameter and made from polyolefin, a high quality material which shrinks to 1/2 its original size when heat is applied. Polyolefin is stable, flame retardant, and can be stored for extended periods of time. Remains flexible after shrinking and provides both electrical insulation and abrasion resistance. Requires a heat source of at least 212°F (100°C) for shrinkage. UL listed and CSA certified. Operating temperature is -67°F to 257°F (-55°C to 125°C). Sold on 150 foot reels.