4 Foot Length of 1 In. diameter Blue Polyolefin Shrink Tubing Four Feet of 1" Blue HIX polyolefin heatshrink tubing Shrinks to half its original diameter Mechanically tough with good abrasion/solvent resistance Used for insulating, jacketing, bundling and identification. SAE-AMS-DTL-23053/5, Class 1 & 2 complient