Steel basket Subwoofer/Non-Pressed Paper Cone
High Foam surround/120 OZ Ferrite Magne/3"4-Layers Voice coil

KSW-1047D4
Description:10"subwoofer
RMS Power:1000w 
Max Power:2000w
Impedance:4×4ΩVoice coil

KSW-1247D4
Description:12"subwoofer
RMS Power:1000w
Max Power:2000w
Impedance:4×4ΩVoice coil

KSW-1547D4
Description:15"subwoofer
RMS Power:1000w
Max Power:2000w
Impedance:4×4ΩVoice coil