Radian 1225-16, Diaphragm for 1"" Driver, 16 Ohm, Highest quality 0.008 mm heat-formed aluminium-alloy diaphragm with Mylar surround., Replacement for diaphragms from JBL and Peavey, Significantly lower distortion rate, Suitable for the following drivers: JBL 2425, 2426, 2427, 2420 and 2416, 2417 with optional back-cap C-1225