Feature●1.7" edgewound copper-clad aluminum voice coil●One-piece PETP polyethylene dome and surround●Celestion CDX1-1730, CDX1-1731, CDX1-1745, and CDX1-1746 diaphragmDescription Get your CDX1-1730, CDX1-1731, CDX1-1745, or CDX1-1746 from Celestion performing like new again with this replacement diaphragm.