Shop Nilight 300PCS CE1 Closed End Crimp Terminal 22-16 Gauge Nylon Insulated Closed End Wire Cap Wire Connectors Crimp Cap Terminals Connectors for Automotive Car Truck Boats Marine Electrical Wiring in high quality, support 2 year warranty. The insulator is made of nylon material, which is not easy to damage or crack; the conductor is high-quality tin-plated copper, which is corrosion-resistant and durable, protecting your connection from vibration.