Polk Audio DB 1000 1-Inch Tweeter Speakers (Pair, Black) Pair of marine-certified tweeter speakers suitable for use in cars, trucks, boats, and other vehicles 1-inch, liquid-cooled, silk/polymer composite dome tweeter with neodymium magnet per speaker Frequency response: 4 to 23 kHz Peak power handling of 180 watts (60 watts continuous) 2.06-inch mounting cutout diameter, flush mount depth of 1.19-inches