[Bullet Terminal Male and Female Connector with Insulating Sleeves] You just need to connect the male and female terminals at both ends, then the male and female terminals anchored to complete the wiring easily. Quick connection. [Superb Material] The bullet terminals are made of brass plated tin, which offer high conductivity, anti-oxidation, the insulating sleeves are made of nylon, insulated flame retardant, safe and secure. [Long Lasting]: Each bullet connector in the electrical connector kit features thick tin-plated brass that resists corrosion to hold the wire tight when crimped. [Safe and Easy to Use] These bullet connectors comply with all electrical standards, perfectly suitable for electrical instruments and automotive applications. Whether you're working on your automotive wire, home project, or science project, our connectors will ensure everything connects properly. [STAY ORGANIZED] - The crimp connector set comes in a storage box, easy to store and carry. You can get 90pcs silver bullet terminals, 90pcs gold bullet terminals, 90pcs male insulating sleeves, 90pcs female insulating sleeves. 1. Prepare the wires to be connected, male and female terminals, insulating sleeves. 2. Connect the connectors. 3. Crimp the connectors with a crimping tool, then connect the male and female connectors at both ends. 4. Connect the insulating sleeves to each other. Silver: 3.9mm Bullet Male----- 45PCS3.9mm Bullet Female----- 45PCS Male Sleeve----- 45PCS Female End Sleeve----- 45PCS Gold: 3.9mm Bullet Male----- 45PCS3.9mm Bullet Female----- 45PCS Male Sleeve----- 45PCS Female End Sleeve----- 45PCS Total: 360PCS Specification Ball Connectors Material: Brass, Tin Insulation Material: PVC, Nylon Color: Silver, Gold Material Description: Tin-plated surface, anti-oxidation. The outer layer is tin-plated to resist oxidation, which can prevent the copper core from being exposed to the air for a long time to form a patina and maintain good electrical conductivity. The inner core is made of all copper, which has excellent conductivity. The interior is made of pure copper, with a large load, low resistivity, good conductivity, and stable and reliable wiring. PVC material, excellent insulation. The male and female bullet connectors are firmly butted and functionally stable.