The Ground Zero COMPETITION GZCF 6.5SPL coaxial speaker set is a 165 mm 2-way coaxial speaker system with paper cone and 25 mm Mylar tweeter. Features: 6.5(16.5cm) coaxial speaker High quality 2-way coaxial speaker Pressed paper cone Long excursion foam W surround Low resonance steel basket 25 mm Mylar tweeter Ferrite magnet 12 dB/octave crossover Hexagon protective grille included Data: Design : 2-way coaxial speaker system Diameter 165 mm Power handling (RMS/max.) 100 / 250 Watt Impedance 4 Ohm Efficiency 93 dB Frequency response 50 Hz - 20 kHz Installation 145 mm Installation depth 72 mm