BlueSpot Heat Shrink Tubing is specially designed to be used in electrical systems. Used to repair cables that have become worn or split, to add strength to wiring and maintain a dry connection for electrical systems. Tubes shrink to half their diameter when heated to provide a secure seal. Can also be used as corrosion proofing for metallic rods and aerials. Includes handy carrying case for quick and convenient storage. Contains 127 assorted black heat shrink tubes.