Performance SeriesPerformance Round MA4056Available 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: 6""Configuration: 2 wayProduct : POLY-PLANAR MA4056 (B) ROUND 80 WATTS PER PAIR 40 EACH Manufacturer : POLYPLANAR Manufacturer Part No : MA4056B UPC : 731128405612 SKU: CW11225