Polk Audio AA3104-A MM1040 10-Inch Subwoofer New Polymer Woofer Cones and Butyl Rubber Surrounds will not break down over time and will survive the rigors of harsh automotive environments. High Temperature Copper Voice Coil (51mm) and Polyamide Former withstands the most rigorous use while maintaining extremely low distortion for bass punch and output. Available in Single and Dual Voice Coil Configurations allowing flexible wiring options. Nickel Plated Heavy Duty Input Terminals accommodate speaker wire up to 8 AWG or twisted pairs of 12 AWG. Available Matching Grilles complement the wheel spoke design.