NTE Electronics 47-20006-BK 3/64" 2:1 6" long, 30 Pack - Black NTE's Thin Wall Heat Shrink Tubing is a high performance, multi purpose, professional grade, flexible, flame retardant, polyolefin based heat−shrinkable tubing with excellent electrical, chemical and physical properties. This tubing is used extensively in industrial and military applications for cable and wire harnessing, strain relief, insulation, color coding, identification and protection against fluids.