This is a Circuit Shop Audio Diaphragm made to Cerwin Vega specs. This diaphragm was used in the Cerwin Vega INT-152, INT-154 and other speakers. It fits the CD34A and many other drivers. Specs: Overall Diameter - 3.15" * Voice Coil Diameter - 1.35" (34mm) * Terminal Centers - 2.87" * DCR - 3.9 ohm * Impedance - 8 ohm. Circuit Shop Audio diaphragms are gaurenteed to fit perfectly and sound just like the original. Dont settle for cheap "aftermarket" diaphragms.