Polk MM1040UM Subwoofer - 10" Stainless steel heavy duty input terminals will not corrode or tarnish Lightweight and rigid carbon composite basket Dynamic Balance Driver Technology for pure, distortion free sound Polymer Woofer Cones and Butyl Rubber Surrounds will not break down over time and will survive the rigors of harsh marine environments Accommodates speaker wire up to 8 AWG or twisted pairs of 12 AWG