Description [8 Ferrule Sizes]: There are 8 sizes of ferrules with PVC insulated sleeves: white 0.5 mm² (200 pieces), red 1 mm² (200 pieces), black 1.5 mm² (250 pieces), blue 2.5 mm² (250 pieces), gray 4 mm² (50 pieces), yellow 6 mm² (25 pieces), gray 7.5 mm² (200 pieces), red 10 mm² (25 pieces). [Good Electrical Conductivity]: The high-quality thick copper ferrule connector with a tin-plated surface conducts electricity stably and has a longer service life. [Insulation Protection]: The back interface of these wire end connectors is made of flame-retardant PVC casing, which is safer for insulation protection. [Easy to Use]: The insulated back end is designed for easy wire insertion, and the tubular ferrule terminal can perfectly wrap your wire without causing problems due to exposed wire. [Wide Applications]: These dual wire ferrules can be used in audio equipment, computer equipment, household appliances, and other electronic equipment. Stable and robust: This innovative and