SB AUDIENCE NERO-12MWN400D, 322.5mm Paper Cone Open Neodymium Midbass 8 OHMFeatures Proprietary cone paper material with silk cotton tree and manila pulp Minimum damping fiber glass voice coil former 2.4" voice coil Long life silver lead wires Weather-proof coated cone paper Designed for open baffle applications Vented pole piece for reduced compression