Wire Ferrules are made with Tin plated copper to resist corrosion and are excellent for tons of electrical installations creating a solid connection with 100% contact. Applications where ferrules are not used often suffer from loose strands fanning out and not connecting which could cause the wire to short out. With all of your wire strands encased and crimped together within a ferrule, a better connection is made for perfect uninterrupted current flow. They also give your applications a much cleaner, professional look.