This speaker system is a perfect fit for many GM cars and European cars that accept a true 6.50-inch speaker. Multiple hole patterns are incorporated into the basket for hassle-free installation into virtually all vehicles that accommodate this size speaker. 6.50 in./165 mm Woofer; 0.50 in./12 mm Tweeter, Grilles Included. Perfect fit in many U.S. and European vehicles. 50 Watts RMS, 4 ohms, 59 Hz - 22 kHz.