This is a Circuit Shop Audio diaprhagm made to Peavey specs. It will fit the Peavey 44A, 44T, 44XT, and 44XTD drivers. Specs: Overall Diameter - 5.00" * Voice Coil Diameter - 3.90" * DCR - 7.9 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.