Warmhoming GTO328 3.5-Inch 2-Way Loudspeaker 3.5-inch two-way loudspeaker Plus One woofer cone with rubber surround 3/4-inch mylar-titanium tweeter 150 Watts peak power handling; 2 ohm impedance 1-7/16-inch mounting depth (37mm) Cutout Diameter: 3-3/8-inch (85mm)