Heat shrink ring terminal connectors are adhesive meltable glue lined wire ring terminals that seal to the wires when heated. You simply crimp the terminal onto the wire strands and then heat to ensure a long lasting connection which will keep air and water out. These are ideal in marine environments wanting a marine grade connection but also in any automotive or other wire connection where long life and high performance is desired. These shrink terminals are designed to fit stranded copper wire in various gauge (AWG) sizes.