Feature 1It has a translucent double-layer polyolefin tube with a special high-grade adhesive sealant and a real copper core electroplated with tin to prevent corrosion. 2Any wire job can be transformed into a fast and efficient process. Just crimp the terminal and heat it. Professional electrical connections can be completed in a few seconds. 3These are not like inlets with brass or tin cores that will break or loosen prematurely. These have the highest grade copper cores, which can achieve the greatest electrical conductivity and the strongest crimping. Tinned copper barrels are designed to keep the joints strong. 4Weather resistance, strong holding power and waterproof hose are ideal choices for our crimp terminals, and ideal choices for your boats and vehicles. 5Allow visual inspection, can prevent wire corrosion, and provide waterproof seal, improve pull strength and stress relief.Item Type: Heat Shrink Wire ConnectorsMaterial: Tinned Copper + Resin Tube .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List25 x Heat Shrink Wire ConnectorsNoteFor best results we recommend using a heat gun.