JT&T"s Heat Shrink Terminals have been adhesive-lined to seal the connection. The translucent tubing allows for visual inspection. Terminals 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.