This is a high quality aftermarket BEYMA CD-10 CD1014ND/FE Diaphragm Please Look And Make Sure The Diaphragm You Are Ordering Matches The Pictures Above & The Specs Below Overall Diaphragm Diameter: 2.96" (88.9mm) Voice Coil Diameter: 1.3/4" (44.4mm) Nominal Impedance: 8 ohms