Steel basket Subwoofer/Non-Pressed Paper Cone
High Foam surround/88 OZ Ferrite Magne/2.5"4-Layers Voice coil

KSW-1049D4
Description:10"subwoofer
RMS Power:750w 
Max Power:1500w
Impedance:4×4ΩVoice coil

KSW-1249D4
Description:12"subwoofer
RMS Power:750w
Max Power:1500w
Impedance:4×4ΩVoice coil

KSW-1549D4
Description:15"subwoofer
RMS Power:750w
Max Power:1500w
Impedance:4×4ΩVoice coil