Thin-wall heat-shrink tubing Polyolefin is great for cable insulation, marking and bundling which adds superior mechanical, abrasion and moisture protection. This tubing is flame retardant and resists common fluids and solvents. 600 volt/mil dielectric strengthSelf-extinguishing tubing will not drip, crack or flow when heated to shrink temperatures2:1 shrink ratio means tubing shrinks to 12 it's ID (inner diameter) sizeErgonomic wings