You'll be rocking the boat with these marine speakers from Monoprice! These speakers are designed for use in marine and other outdoor applications. They are constructed with a polypropylene/mica speaker woofer cone and PEI tweeter, which are resistant to both water and ultraviolet rays, making them ideally suited to installation on the outside of a boat, by a pool, or just about anywhere outdoors. The speaker cone has a rubber edge for both flexibility and water resistance. There is also a rubber seal inside the mounting holes, which helps keep the back of the speakers dry. They have thick, impact-resistant, white plastic face plate, which will withstand bumps and scrapes without breaking or scratching. This model features a 6 1/2" woofer cone and a 13mm PEI dome tweeter. It has an impedance of 4 ohms and is suited for use with amplifiers rated for 80 watts per channel.