JT&T"s Nylon Insulated Terminals have been injection molded with funnel entry for fast, easy wire insertion. Terminals have "V" groove serrations to provide maximum contact and tensile strength after crimping. JT&T"s terminals are constructed from pure copper (Alloy 110), annealed & electro tin plated. Electro Tin plating provides exceptional corrosion resistance. Insulator sleeve is color-coded for wire size and identification. JT&T Products offers a full line of terminals made from vinyl (P.V.C), nylon and heat shrink.