Performance SeriesPerformance Round MA4054Available in black and white, the MA4000 series of low magnetic field speakers are ideal as initial, upgrade, or replacement speakers. Coated internal wiring for long life UV stabilized plastic grilles polypropylene cones Heavy Duty ABS Plastic frames Low Magnetic Field does not interfere with compass and autopilot Specifications (per speaker):Max RMS Power: 20 WattsMax Peak Power: 40 WattsMain Cone Size: 4"Configuration: 2 way MPN: MA4054W UPC: 731128405407