Radian 1225-8, Diaphragm for 1"" Driver, Replacement for diaphragms from JBL and Peavey, Impedance: 8 Ohm, Highest quality 0.008 mm heat-formed aluminium-alloy diaphragm with Mylar surround, Significantly lower distortion rate, Suitable for the following drivers: JBL 2425, 2426, 2427, 2420 and 2416, 2417