4 PCS 15″ Carbon Fiber Cone with Surround 4″ VC

15 “carbon sandwich cone bonded together with a (U) surround. Ideal for SPL applications, but also for music listeners. Because of the sandwich structure, the membrane is extremely stiff, but thanks to the inner foam layer, it is also ideal for music. Cone : Number of layers: 3 Overall diameter: 302 mm Depth: 79 mm Voice coil opening : 4” – 101 mm Surround : Overall diameter : 375mm Inner diameter : 280mm Height : 23mm