Rockford Fosgate T1D410 Power 10" T1 4-Ohm DVC Subwoofer Symmetrical dual progressive roll tear resistant poly-cotton spiders Periodic-stitched fatigue resistant tinsel lead wire Proprietary 8 AWG insulated allmetal input spring terminal connection High-temp voice coil with spun-laced Nomex&#174; re-inforcement collar Optimized and matched magnetic and complicance geometry