HellermannTyton’s Part 308-30906 is a Heat Shrinkable Tubing 3:1 on a Reel, 9/3 Blue. The product includes a flexible resin tubing with a heat-activated adhesive lining which provides an environmental seal when correctly installed. This product is designed to protect and insulate the wiring and cables from mechanical abuse, solvents, and other harsh environmental conditions. It's also ideal for strain relief, wire bundling, termination, and wire identification. The product is also resistant to water, solvents, salts, acids, alkalis, and oils and should be installed using a hot air gun or other suitable tool.