The Pyle PLMRS4B is a set of 4" marine-grade waterproof speakers designed for use in boats, marine watercraft, and off-road vehicles. These speakers are built with durable aluminum materials and feature a low-profile, slim design for easy installation. The 2-way full-range stereo sound ensures clear audio reproduction with impressive bass response. With a waterproof and weather-resistant construction, these speakers are perfect for outdoor environments. They come with mounting screws and speaker wires for easy setup.