For :B&C DE75-8,DE75TN,DE750-8,DE750TN,DE82,DE82TN,DE85,DE85TN,DM5001 

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: 0 .05 mm

Nominal Impedance:  8 ohms