Boss Audio MR50 White 5.25 Round Marine SpeakersBoss Marine Loudspeakers are designed to withstand the harsh conditions of the marine environment. All frame and grill sections are made of a polymer composite that is completely waterproof with a coating to protect against damage from UV rays. We use rubber surrounds and polypropylene cones to complete the waterproof package. The tinsel leads are coated to prevent corrosion. In addition to the material engineering qualities and we are proud to say these speakers sound awesome.MR50W (White) 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: Plastic Product : BOSS AUDIO MR50W WHITE 5.25 ROUND SPEAKERS (PAIR) Manufacturer : BOSS AUDIO Manufacturer Part No : MR50W UPC : 791489240031