Alpine Swr-t10 10-Inch 1800 Watt 4 Ohm Shallow Mount Subwoofer 10" Single 4 Ohm Type-R Shallow-Mount Subwoofer Injection Molded Santoprene rubber surround Thin design allows for installation in compact areas Vented voice coil heat sink, and airflow management system keeps subwoofer cool, while reducing distortion Neodymium 35SH magnet structure