Dual LU47PB 4" 3-Way Indoor/Outdoor Speakers (Black)4" polypropylene woofer with rubber surround ; 1" polypropylene midrange; . 75" piezo tweeter; Includes removable mounting brackets; 4ohm 6ohm impedance; 50W RMS; 200W peak power; Nonremovable grilles; Rotating logo for versatile mounting options; Two 1 4" 20 insert mounts on rear of each speaker; UV treated ABS enclosure; Brackets compatible for walls or ceilings constructed of solid wood, brickwork, concrete, hollow buildings block or wood studs;