This is a Brand New Aftermarket Diaphragm For YAMAHA Models 8 Ω. Yamaha: NB074960, JAY-4201, JAY4201, JA-4201, JA4201, JAY-4207, JAY4207, JA-4207, JA4207, JAY-4208, JAY4208, JA-4208, JA4208, S-4115, S4115, S-4115H, S4115H, and many more. This diaphragm handles the same amount of power and sounds just like the original ! Specs : Overall Diameter -- 2.75" (70.42mm). Voice Coil Diameter -- 1.65" (42.04mm). Impedance -- 8 Ω We Carry A Full Line Of RCF, Celestion & Eminence Speakers & Drivers If Youre Looking A Particular Model And You Dont See It Here Please Send Us A Message. Most Orders Placed Before 3PM and Paid thru PayPal Are Shipped The Same Day; Monday to Friday.