MB Quart Formula 5.25 inch 2-way coaxial car speakers with aluminum dome tweeters and Butyl rubber surrounds.Weight 3.1 lbsType SpeakerBrand MB QuartSeries FormulaCategory MobileCondition NewColor BlackWarranty 1 YearSpeaker RMS Power Handling (watts) 45Speaker Peak Power Handling (watts) 90Speaker Impedance (ohms) 60Hz-20kHzSpeaker Sensitivity 88dBSpeaker Crossover Slope 4kHz 12dBSpeaker Mounting Diameter / Cut Out (in) 4.48Speaker Outside Diameter (in) 6.26Speaker Mounting Depth / Chassis Depth (in) 2.0Speaker Size (in) 5.25Proposition 65 Notice WARNING: This product can expose you to chemicals including LEAD, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.