Boss Audio MR50B Black 5.25" Round Marine SpeakersBoss Marine Loudspeakers are designed to withstand the harsh conditions ofthe marine environment. All frame and grill sections are made of a polymercomposite that is completely waterproof with a coating to protect againstdamage from UV rays. We use rubber surrounds and polypropylene cones to complete the waterproof package. The tinsel leads are coated to preventcorrosion. In addition to the material engineering qualities and we areproud to say these speakers sound awesome.MR50B (Black) 5.25" 2-Way Speaker Features: Power Handling, Peak: 150W Magnet Structure: 30 Oz Impedance: 4 OHM Frequency Response: 120HZ-18KHZ Spl 1 watt/1 meter: 90dB Cone Material: Poly Injection Voice Coil: 3/4" Aluminum Tweeter: 1" Mylar Dome Grilles: PlasticWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.