Features: 1) Material: UL approved nylon 66, fireproof standard: 94V-2, heat, acid and erosio Features:1) Material: UL approved nylon 66, fireproof standard: 94V-2, heat, acid and erosion resistant, insulating, durable and not apt to age2) Internal tin plated long copper tube ensures perfect connection with wires Packing:1,000/500/200pcs/polybag Sell Close-End Wire Connector