OSD Audio ACE520 5.25-inch 100-Watt Trimless Thin Bezel Mica Filled Polypropylene In-Ceiling Speaker with Bass and Treble Switch, Pair Woofer: 5 1/4-Inch mica-filled polypropylene cone with butyl rubber surround Tweeter: 3/4-Inch Pivoting silk soft dome Power handling: 100W, Impedance: 8 ohms Frequency Response: 75Hz- 22kHz, Sensitivity: 91db Unit Dimension: Diameter 7 7/8-Inch x 3 1/2-Inch, Cut-Out Diameter: 6 5/8-Inch Shipping: This item does not ship outside the U.S