Large foam surround giving great xmax and bass precision while keeping great cone control when the subwoofer is close to maximum power. ^^ Great power handling of 300w RMS and 600w max through a high strength 1.5 inch aluminum voice coil. ^^ Very strong stamped basket with show quality DS18 logos on the frame, magnet boot, magnet, and dustcap. ^^ Designed to give crisp and clear bass in any vehicle and can be used in sealed and ported boxes. ^^ The ZR subline is a great entry level subwoofer that both handles great power and gives you smooth clean bass.