MSX60RVR6-1/2 Coaxial Marine SpeakerWaterproof and designed for marine useMax power handling: 75 wattsSensitivity: 91dBFrequency: 65Hz-20kHzNominal impedance: 4 OhmsPolypropylene woofer: 6-1/2Magnet: 11oz.Mounting hole diameter: 5Mounting depth: 2-1/3Tweeter type: DomeTweeter material: TitaniumASTM B117 salt spray exposure standard compliantASTM D4329 UV exposure standard compliantWARNING: 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.