This is a Circuit Shop Audio diaghragm made to Peavey specs. This diaphragm fit Peavey 22A, 22T, 22XT, 22XT+ Drivers. Specs: Overall Diameter - 4.54" * Voice Coil Diameter - 2.0" * DCR - 5.5 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.