Are these genuine Beryllium membranes?

[NiToNi]

A guy wants to sell me his JBL 2435HPL but cannot confirm they have the Be membranes (he bought them on eBay a decade ago and haven't been used since). I am no expert myself either so I would appreciate if someone could confirm whether these look like the real deal or not. This is what they look like:

84284

84288

84286

84287

Provided these are Be, what are they worth? I see the newer Aquaplassed 435Be going for between $700-1000 a pair ever so often.

[Robh3606]

They sure look right. They are a dull dark grey, not trusting the picture? The aluminum ones 2431 are a bright silver color. Worth? Check eBay

Rob:)

[grumpy]

Figure on replacing the ferro-fluid/oil in the gap (if not done by previous buyer or unknown). Looks like the stock Be dia.

[NiToNi]

Thanks guys, that’s reassuring. Is it difficult to top up the ferro fluid and is it standard ferro oil?

[cooky1257]

You'll need some nice H9800 horns and ME150HS drivers to go with them so give me a pm.
https://pinkfishmedia.net/forum/threads/jbl-k9800-be-project.119290/
Use the correct fluid=APG S38N from Ferrotec