3 3-Inch high compression neodymium super tweeters with aluminum dome sold as a pair ^^ Peak Power 300 watts (Pair) ^^ RMS Power 150 watts (Pair) ^^ High temperature 1 3" Voice coil ^^ Impedance 4 ohms ^^ Usable Frequency Range 2 0 KHz - 25 KHz ^^ Sensitivity 109 dB ^^ Lightweight And powerful neodymium magnets provide extreme power and ultimate versatility