Steel basket Subwoofer/Non-Pressed Paper Cone
High Foam surround/80 OZ Ferrite Magne/2"4-Layers Voice coil

KSW-1050D4
Description:10"subwoofer
RMS Power:400w 
Max Power:800w
Impedance:4×4ΩVoice coil

KSW-1250D4
Description:12"subwoofer
RMS Power:400w
Max Power:800w
Impedance:4×4ΩVoice coil

KSW-1550D4
Description:15"subwoofer
RMS Power:400w
Max Power:800w
Impedance:4×4ΩVoice coil