[Quick connection] Just prepare a crimping tool, then you can crimp the male and female bullet connectors together and connect the wire in a few seconds without soldering. Save time and improve work efficiency. [Durability] Each ball terminal features a thick tin-plated brass that resists corrosion to hold the wire firmly when crimping. [Premium Brass Plated Tin] Circular connectors are made of brass plated tin, which provides high conductivity and oxidation protection.Insulating sleeves are made of nylon, insulated, flame retardant and safe. [Wide Applications] These circular connectors meet all electrical standards and are perfect for electrical instruments and automotive applications. Whether you're working on your automotive wiring, your home, or your science project, our bullet terminals wire connector ensures everything is connected properly.