This Is A Brand New Aftermarket Diaphragm , "Titanium" For : 74.5mm Driver Please Look And Make Sure The Diaphragm You Are Ordering Matches The Pictures Above & The Specs Below Specs: Overall Diameter Across: 4.33" (110 mm) Overall Diameter Length: 6.125" (155.5 mm) Voice Coil Diameter: 2.93" (74.5 mm) Diaphragm Material: Titanium KSV-CCAR Diaphragm Thickness: .05 mm Nominal Impedance: 8 ohm The Center Distance Of The Two Post Terminals : ~137.0mm