Aluminium basket Subwoofer/Non Pressed Paper Cone
High Foam surround/280 OZ Ferrite Magnet/3"4-Layers Voice coil
KSW-1034D4 
Description:10"subwoofer
RMS Power:2000w                   
Max Power:4000w
Impedance:4×4ΩVoice coil
KSW-1234D4 
Description:12"subwoofer
RMS Power:2000w
Max Power:4000w
Impedance:4×4ΩVoice coil
KSW-1534D4
Description:15"subwoofer
RMS Power:2000w
Max Power:4000w
Impedance:4×4ΩVoice coil