Dome Piezo TweetersFrequency Response: 4k-20kHzNow Improved 600W max (300W each tweeter)Impedance: 4~16 ohmsBUILT-IN CROSSOVERDiameter: 1.73" (44mm)Height: 0.9" (23mm)Height with self-adhesive disc: 0.95" (24mm)True Micro Domes, Small Size fits just about anywhere! For All Audio Systems No Magnetic Field High efficiency with Only 2.8v You Can hear 97db, more sound with less energy! Includes:2 Tweeters 2 Double-sided self-adhesive discs Mounting Screws