AFTERMARKET DIAPHRAGM For EV ND2 

This is a  aftermarket diaphragm that fits for many Electro Voice models.

Specs:

Overall Diameter: 3.125" ( 79.38mm)

Voice Coil Diameter: 2" ( 50.80mm) 

Diaphragm Material: Titanium

Nominal Impedance: 8 ohms