Check the listing for details. Replacement RCF M82 Diaphragm for N850 Driver, 8 Ohms Titanium w/ The Foam Ring. Condition: New. Listed at 34.49 USD. This Is A Brand NEW Aftermarket Replacement RCF M82 Titanium Diaphragm For 8 Ohm N850 with the Foam Ring On Top To Seat The Diaphragm Properly Just Like The Original ! Please Look And confirm The Diaphragm You Are Ordering Matches The Pictures Above & The Specs Below. Specs :Voice Coil Diameter :74.4mmImpedance : 8 OhmDCR : 6.0 OhmDome Height : 13.9mm Overall Diameter : 102.5mm The Center Distance Of The Two Post Terminals : 120.0mm We Carry A Full Line Of RCF, Celestion & Eminence Speakers & DriversIf You're Looking A Particular Model And You Don't See It Here Please Send Us A Message FREE SHIPPING ONLY In the Lower 48 States.Most Orders Placed Before 2PM and Paid thru' PayPal Are Shipped The Same Day; Monday to Friday.