This Is A Brand New Aftermarket BMS 4554 Replacement 8 ohm Diaphragm. Please Look And Confirm The Diaphragm You Are Ordering Matches The Pictures Above & The Specs Below. Specs: Overall Diaphragm Diameter: 3.71" (94.4mm) Voice Coil Diameter: 1.75" (44.4mm) DCR: 6 Ohms Nominal Impedance: 8 ohms