We feature JT&T Products wire terminals. These are high quality and ensure the best possible connection. Electro Tin Plating for Exceptional Corrosion Resistance. Mill Specs: MIL-T-10727C, Type 1, ASTM B 545 B. .0001” - .00025” Thick. Insulator sleeve is color-coded for wire size and identification. Our rings, spades and butt terminals are constructed from pure copper (Alloy 110), annealed & electro tin-plated. Insulators made from P.V.C., nylon or heat shrink. Wire terminals and connectors are clearly marked with size. Terminals have “V” groove serrations to provide maximum contact and tensile strength after crimping. P.V.C. and Nylon injection molded with funnel entry for fast, easy wire insertion.