Ferrofluid 900uL General Purpose for 4 Inch Diameter Coil

Excellent didn’t job restoring my speakers tweeters.

Great stuff right there

This kit brought back my ~30 year old Vifa D25AG back to its former self. The old ferrofluid had dried out and was gummy like earwax or worse. Tried using solvent like acetone and OS-10, but that was not super effivient but OK. You don't have to squeeze the fluid out, it gets pulled out in a fine stream from 8mm away, so only a small hole is needed. I used half of the 900ul for two 1" tweeters.

Works but EXPENSIVE!

Kef 104 tweeters are sounding great again, do this yourself, very easy