Papco® Wiring Terminals are constructed from pure electrolytic copper, annealed and electro-tin plated. The one-piece construction provides a terminal of maximum strength and electrical conductivity. The electro-tin plating affords maximum protection against corrosion. Funnel barrel entry assures easy wire insertion and a positive, solid crimp. Insulation is color coded for the appropriate wire-gauge: Red 22-18, Blue 18-14 and Yellow 12-10.