Sound Storm Laboratories H205 5.25-Inch 2-Way Marine Speaker with 200 Watts Poly injection Cone Peak Power Handling: 200 watts Magnet Structure: 30 Oz Impedance : 4 ohm Frequency Response: 120hz-18khz Efficiency: 90db (1 Watt/1 Meter)Cone Material: Poly Injection Voice coil: 3/4" aluminum Tweeter 1" Mylar Dome Plastic Grilles Mounting Depth: 2-1/8" Magnet Structure: 30 oz Impedance: 4 ohm Frequency Response: 120hz-18khz Efficiency: 90db (1 Watt/1 Meter) Cone Material: Poly Injection