15-PRX4102 - Memphis 4" x 10" 50W RMS 2-Way Coaxial Speakers 15-PRX4102 - Memphis 4" x 10" 50W RMS 2-Way Coaxial Speakers RMS / Peak: 50W / 100W Polypropylene Cone. Sensitive enough to sound great, even with a factory car audio system. Polyurethane Surround. Durable and lightweight for high-efficiency and quick response. Mounting Depth: 2.5"