4-layer Fiberglass ConstructionShaped MicroPerf aluminum grilles making it look natural and realisticWeatherproof Design Surpasses Military Standard 883 for Corrosion ResistanceDesigned for extreme environmental conditionsUV Exposure and Water Resistance3/4" Kaladex Domes with fluid-cooling and ultra-wide dispersion for clear and detailed high-frequencies5-1/4" Injection-molded TCC (talc, Carbon, And Ceramic) Filled Polypropylene Cone is extremely rigid to reduce breakup and lower distortionButyl Rubber Cone Surround damps resonance and provides exceptional durabilityNoFade Protective PaintCone Forward design positions drivers close to the grille and ensures intelligible midrange