This Is A Brand New Diaphragm for SS Audio Diaphragm for Mackie HD1521 Horn Driver DC10/1801-8 0025726 Has A Blue Titanium Dome With Vents

Specs:

Overall Diameter – 2.78″ 

Length – 4.18″

Voice Coil Diameter – 1.75″ – 44.4 mm

 Impedance – 8 ohm