Feature●Voice coil: 1.75" (45mm) Diameter: 2.75" (70mm)●Impedance: 8 ohm●Titanium ribbed dome with voice coil on Kapton former●Please check your model before ordering to make sure you are getting the correct diaphragm.●Fits Selenium: D220Ti, RPD220Ti, D2500Ti-Nd, D225Ti, and many others.Description Fits:Selenium: D220Ti, RPD220Ti, D2500Ti-Nd, D225Ti, and many others.