MB Quart Discus 3.5-inch 2-way coaxial car speakers with aluminum inverted dome tweeters and butyl rubber surrounds. Compatible Vehicle Fitment Universal Tweeters Aluminum inverted dome tweeters deliver great sound with increased reliability. Cone Material Lightweight thermal-formed polypropylene cones enable faster midrange response. Surround / Cone Coupling Butyl rubber surrounds provide durability and deeper mid-bass impact. The cone/surround connection utilizes a high temp adhesive which assure the cone and surround do not separate in high power uses or extremes of weather. Voice Coil / Former Assembly Pure Copper voice coil creates a strong magnetic field with a very thin extrusion. Kapton voice coil former is lightweight and efficiently dissipates heat. Spider Natural fiber allows flexibility while the infused epoxy gives strength during the manufacturing process. Cooling System Over-coil cooling system allows air exchange over the voice coil through the spider Crossover 6dB internal crossover integrated into the design to assure smooth midrange to tweeter frequency transitions. Frame Heavy gauge progressive-die stamped steel frames for ultimate rigidity. Motor Ferrite magnet motor creates a strong magnetic field while remaining small enough to fit nearly every application. Connectors Use spade connectors or solder direct for the best connection. Tinsel Leads: Highly conductive while remaining flexible during high power applications. Details & Specs Type Speaker Brand MB Quart Series Discus Category Mobile Condition New Color Black Warranty 1 Year Compatible Vehicles Universal Speaker RMS Power Handling (watts) 35/70 Each & System Speaker Peak Power Handling (watts) 70/140 Each & System Speaker Impedance (ohms) 4 Speaker Frequency Response 80Hz-20kHz Speaker Sensitivity 88dB Speaker Crossover Slope 12dB/octave Speaker Mounting Diameter / Cut Out (in) 3.5 Speaker Outside Diameter (in) 3.5 Speaker Mounting Depth / Chassis Depth (in) 2.0 Speaker Size (in) 3.5 Proposition 65 Notice WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov