Marine speakerssuitable for installation on any type of boat. Resist without any problem to corrosion by salt water, even after installation the color remains unchanged,without undergoing mutations due to atmospheric agents. White ABS, coaxial 2-way, max peak power 180W, impedance 4 ohms,frequency response 80Hz-20Khz. Woofer Material PP Carbon.They also include the special system of ducts that allow for easy drainingof accumulated drops from condensation. Size ext. mm. 196 mm Ø hole.139 mm depth. 66.