This Is A Brand NEW Aftermarket Replacement RCF RC-CD250 Diaphragm @ 8 Ω For RCF 25118027 Driver Use On RCF ST 12-SMA Speaker System. This Will Not Work on RCF ND1410 Driver. Please Look and Confirm the Diaphragm You Are Ordering Matches the Pictures Above & The Specs Below. Specs: Impedance: 8 Ohm Dome Material: Mylar