The HellermannTyton 300-73160 Heat Shrink Tubing and Sleeves Low-Heat Shrinkable Tubing 3:1 self extinguishing and overexpanded 6,6/2,4 are an ideal solution for protecting and insulating a variety of electrical components from electrical short circuits, corrosion, and other environmental elements. The tubing is a high quality product made using a 3:1 shrink ratio, meaning that it will shrink three times its original size when heat is applied. This product is also self-extinguishing, meaning that any fire that occurs will be immediately stopped once the source of the heat is removed. Additionally, the tubing is overexpanded six times its diameter, providing flexibility and increased insulation properties. This product is suitable for use in a variety of electrical applications and is UL recognized and CSA accepted.