Pioneer TS-A878 3 1/2 Inch 2-Way Speakers Carbon-graphite blended IMPP composite cone woofer One-inch PEI (Poly-Ether Imide) dome tweeter Custom-fit for GM, Ford and Volkswagen vehicles 3-1/2-inch, two-way speakers with 60 watts maximum power handling (15 watts nominal) Carbon-graphite blended IMPP composite cone woofer One-inch PEI (Poly-Ether Imide) dome tweeter Custom-fit for GM, Ford and Volkswagen vehicles 60 Hz to 28 kHz frequency response; 88 dB sensitivity