You Will Receive 2 Brand New Pairs of Tweeters for a Total of 4 Tweeters Brand: Pro Master USAModel: SPT-180 Dome Piezo Tweeters with Coil ExciterCAR OR HOME HIGH EFFICIENCY TWEETERSNow Improved 1000W 2 pair (250W each tweeter) peak powerImpedance: 4~8 ohmsBUILT-IN CROSSOVERDiameter: 1.45" (37mm)Height: 0.8" (20.5mm)Height with self-adhesive disc: 0.83" (21mm)Height with base: 0.925" (23.5mm)True Micro Domes, Super 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! 2 Mounting Options This listing includes:4 Tweeters 4 Clip-on Bases 4 Double-sided self-adhesive discs Mounting Screws