1pcs 

Replacement Diaphragm Model Comp 4D-MX

this will fit the following B52 cabinets:

 B-52: Comp 4MX, MX1515, MX 15, MX-MN15

specs:

Voice coil: 1-3/4″ (45mm)

Diameter: 3-15/16″ (100mm)

Length: 4-1/4″ (108mm)

Impedance: 8 ohm

Titanium dome with copper voice coil on Kapton former