This is a high quality aftermarket For JBL diaphragm 

Outside Diameter: 2.75" (69.85mm)

Voice Coil Diameter:  1.5" (37.9mm) 

Impedance:  8 ohms 

Dome Material: Polymer

Voice Coil: Aluminum Wire

Here is a list of the driver part #'s:

2408, 2408H and more.

Here is the list of some of the cabinet model #'s:

 

MRX Series: MRX-512M, MRX-515, MRX-525 

PRX Series: PRX-512, PRX-512M, PRX-512MI, PRX-512, PRX-515, PRX-525, PRX-535, PRX-535S, PRX 612M/230, PRX 615/230, PRX 625/230 

Vertec Series: VT-4887A, VT-4887ADP