Check the listing for details. Labwork 1 Pair 10 Feet Black + Red Solar Panel Extension Cable Wire Connector. Color: Black,Red, Condition: New, Made in United States. Listed at 15.26 USD. Fitment:The Advantages Of Tinned Copper Wire Compared To Pure Copper Wire:-The Tin Plating Of The Copper Wire Is Mainly To Prevent The Copper From Being Oxidized To Form A Layer Of Film-Copper Green When Exposed To The Air. The Patina Has Poor Conductivity And Will Increase Resistance. Tinned Copper Wire Can Prevent Redox Reaction And Produce Patina; Can Increase Heat Dissipation; Can Improve Conductivity And Improve Wire Performance.-In Addition, Tin Plating Of Copper Wires Can Also Prevent The Insulating Rubber From Sticking, Making The Core Black And Brittle, And Improve Its Solderability. Tinned Copper Wire Is Mainly Used For Rubber Insulated Mine Cables, Flexible Wires, Flexible Cables And Marine Cables As Conductive Cores, As Well As Outer Shield Braid.