? ClearPlus Leading Edge� rubber technology uses highest grade all-natural rubber formulation, precision slitting and Molybdenum coating on rubber surface: Provides quiet, chatter, streak and smear free wiping in both directions. Provides resistance to splitting and tearing due to road and weather conditions. ? All metal galvanized steel frame with embedded riveted hinges provides durability against rust and corrosion and safety in rough, stormy wiping conditions.