This Is A Brand NEW Aftermarket "Titanium" Diaphragm. For ERIC or BOUTUM Driver. Please Look And Confirm The Diaphragm You Are Ordering Matches The Pictures Above & The Specs Below. Specs: Overall Diameter: 4.63" (117.5 mm) Voice Coil Diameter: 2.97" (75.5 mm) Diaphragm Material: Titanium Nominal Impedance: 8 ohms Most Orders Placed Before 3PM and Paid thru PayPal Are Shipped The Same Day; Monday to Friday