Powerbass S522 5.25-Inch Coxial OEM Speakers Metal ring is included for mounting standard 4x6" Su or metric locations 4-Ohm Nominal impedance 86db efficiency 2 4x6" 2-way speakers Mounting depth 2.125 inches driver cutout 3x6.125 inches DDC treated paper cone woofer pure silk dome tweeter 120 Watts peak power handling 4-ohm nominal impedance 87db efficiency Paper cone woofer with DDC coating - Dynamic Damping Coating 0.75-Inch Pure silk dome tweeter Two 5.25-Inch 2-way speakers with mesh grills 2 inch mounting depth Kit includes mesh wire grills speaker wire mounting hardware application guide and PowerBass decal