... basket four layer copper wire voice coil, dual magnet, blue wiredrawing PP cone car speaker,Car Subwoofer Parameters CSW-680-10BLUESize10 inchRated Impedance 4 ... copper wire voice coil, Φ140ferrite magnet, dual magnet,blue wiredrawing PP cone,chrome plating T-yoke,plate. Car Speaker CSW-680-12BLUE subwoofer