Diaphragm 4 Pack fits JBL 2412H, 2412H-1, Soundfactor, MPro, JRX100, D-2412-4 Premium SS Audio Diaphragm for JBL Speaker CONTRACTOR 4-pack Part # D-2412-4Impedance: 8 ohm, DCR: 4.3 ohm Specs: Voice coil: 1" (25mm),Diameter: 2-5/8" (68mm), Length: 3-1/2" (89mm), Impedance: 8 ohm, DCR: 4.3 ohm, All Metal Diaphragm, just like the original JBL SUPERIOR quality, LARGEST selection, and the BEST prices! FREE technical support. FAST & FREE shipping to any USA address. To get the BEST quality repair parts, be sure to buy ONLY from SS Audio and Simply Speakers. Thank you!