4) Power Acoustik NB-1 1" 400W 2 Way Mount Car Micro Dome Super Tweeters NB1
Utilizing Niobium, a rare magnet material, NB tweeters provide crystal clear highs. A built-in high-pass crossover prevents low frequencies from causing distortion, ensuring transparent detail. A lightweight, high sensitivity & low distortion Polypropylene dome allows accurate reproduction of high frequencies for an open sound stage, enhancing any audio system. Niobium Rare Earth Ferroelectric Transducer, Magnet,    Polypropylene Diaphragm,    100 Watts R.M.S.,    Freq. Resp. 5kHz to 25KHz,    Imp. 4 Ohm,    Surface/Angle Mount,    SPL 97 dB,    Built in Crossover. 1 buy = 4 tweeters!