This Is A Brand New Original Martin Audio F 15, Diaphragm For B&C DE82 Made By P Audio. "Blue Titanium" Will Also Fit :B&C DE75-8,DE75TN,DE750-8,DE750TN,DE82,DE82TN,DE85,DE85TN,DM5001 Yorkville TX4 Cabinet Please Look And Make Sure The Diaphragm You Are Ordering Matches The Pictures Above & The Specs Below Specs: Overall Diameter: 4.31" (109.5 mm) Voice Coil Diameter: 2.93" (74.46 mm) Diaphragm Material: Titanium Diaphragm Height: 13.5 mm Diaphragm Thickness: .05 mm Nominal Impedance: 8 ohms