Black Insulated In-Line Splice 250 - 6 (Pkg of 2) Save when you buy the 2 pack! Insulated Electrical Power Connector In-Line Splice - Black Insulated Splice for easy fast hassle free installations 6061-T6 Aluminum CU9AL Dual Rated for use with Copper and/or Aluminum wires Insulated Splice with rugged high-dielectric Rubber/Vinyl Coating Pre-Filled with Oxide Inhibitor